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/sci/ - Science & Math

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4717914 No.4717914 [Reply] [Original]

Is it possible someone can help me do my mathwork.
I need someone to do the problems for me, but please work them out, in steps.

It would also be nice if you could explain how this is done so that I can understand it.

I'll be honest, I really just want this shit done (im already far behind, I just need it to go away), but if it could be explained to me in the process, that would be good.

>> No.4717919
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4717919

What type?

>> No.4717920

please respond.

I'm sure there are some people on here that are bored enough to help me.

>> No.4717921

Do you really think someone is just going to do your homework for you out of the goodness of their heart? Is this your first day on the interwebs?

>> No.4717924

>>4717919

9th grade algebra.
I'm in 12 grade but horrible at math. They've agreed to let me graduate this year if I can finish algebra and geometry by November.

>> No.4717930

>>4717921
I would do it, if it was chem homework. Just because i like chem.

>> No.4717935

I'll happily help OP bored out of my skull. Post it.

>> No.4717940
File: 9 KB, 544x548, test18.gif [View same] [iqdb] [saucenao] [google]
4717940

>>4717935

11. Factor 32x3 – 32x2 + 8x by first finding the GCF, then factor the quadratic that is left. Be sure to factor completely and show your work. If this is not possible for some reason, state why.

12. Factor x2 + 9x + 14 by grouping. Be sure to factor completely and show your work. If this is not possible for some reason, state why.

13. Factor 4x6 – 16x2 using the difference of squares method. Be sure to factor completely and show your work. If this is not possible for some reason, state why.

14. Factor x2 + 16x + 64 by using the perfect squares method. Be sure to factor completely and show your work. If this is not possible for some reason, state why.

15. Factor x2 + 9 using any method you choose. Show your work. If this is not possible for some reason, state why.

16. Solve -3x2 - 9x + 12 = 0.

17. Solve x2 - x = 56

18. Solve the quadratic equation by using the graph.

19. The product of two consecutive positive integers is 42. Write and solve a quadratic equation to find the numbers.

20. A cannon ball is shot from a cannon on top of a hill that is 73.5 meters above sea level. The cannon ball leaves the cannon with a velocity of 9.8 m/s. Write and solve a quadratic equation to determine when the cannon ball will reach sea level.

>> No.4717941

khan academy

>> No.4717974

>>4717941

???

>> No.4717981

>>4717974

A web site for learning math, bozo.

>> No.4717982

>>4717940
11. 32x3 – 32x2 + 8x -> GCF 8 -> 8x(2x - 1)^2
12. x2 + 9x + 14 -> (x + 2)(x +7)
13. 4x6 – 16x2 -> -2^3
14. x2 + 16x + 64 -> (x + 8)^2
15. x2 + 9 -> (x-3i)(x+3i)
16. x = -4, 1
17. x = -7, 8

cont.

>> No.4718002

>>4717981

Looked at them, they dont seem to be of any help when it comes to factoring quadratics.

>> No.4718015

>>4717930
But you are bad at it...

>> No.4718022

>>4717982
Thank you very much for helping me so far.

>> No.4718032

bumping to prevent 404

>> No.4718036

>>4717940

by x2 do you mean x^2 (squared) (thats when there's a little 2 above the big number, sorry I don't mean to sound sarcastic you just might be really stupid for all I know)

>> No.4718052

>>4718022
Sorry dude just had to restart. Will have the answers back shortly.

>> No.4718063

>>4718036
that's copied DIRECTLY from the online lesson. The mistake is the teacher's, not mine. Also, I would have put it as x^2

>> No.4718090

>>4718052
I understand

>> No.4718102

>>4718036
cont.

19. x2 - 13x + 42 = 0


20. Confuses the crap out of me. Need to check a few things.

>> No.4718106

What about 18?

>> No.4718111

>>4718106
Sorry.

18. x^2

>> No.4718116

>>4718111
Danke

>> No.4718126

i can do 18 and maybe teach some stuff.

alright look at the graph. see how its centered on the middle line, x=0? that means no shift left or right, kinda the hard side to this stuff.
now look at the direction of the graph. quickly put into your graphing calc or a program, and you will see that the generic y=x^2 graph points up. look back at our graph, its pointing in the same direction, so you know that it isnt multiplied by a negative. plugin y= -(x^2) and you see that the graph points in the opposite way, pointing down.
okay so we have y=x^2 so far

now look at where the graph crosses the x axis. your teacher may have called these "zeros" these are points on the graph where y=0. because its a quadratic graph, there are only two (if it was x^3 there would be tree zeros). See where the line crosses. At x=1 and x=-1 so it should be something like this:
y=(x-1)(x+1)
if you set y=0, and plug it in, then you can see that 0=x-1 and 0=x+1
so solving for x on both, x= 1 and -1 (this is to just double check)

so far we have y=(x-1)(x+1)

notice that this is still quadratic (meaning its x^2) if you multiply it out

okay final step is to find shifts up and down.
the generic x^2 graph gives the crux at (0,0)
however on our graph, its at (0,-1). to manipulate the graph, simply add -1 to the equation, so that every value you put in for x, y is shifted down by 1. so add if its shift up or minus if shift down.

there fore y=(x-1)(x+1) -1


i had a hard time learning this too in hs, but i loved to play around with my graphing calculator and seeing what shifts did what to the graph. the calculator was my savior in alot of the tests that asked for what the shifts did to the graph.
so just play around with the calculator. if you dont have one, i was a dirt poor asian at my school, i borrowed one from the library, even though it was super old.

>> No.4718131

>>4718126

18. Solve the quadratic equation by using the graph.

i wrote that by looking at the picture you attached.
i assumed solve meant create a function that models the graph...

no...?

>> No.4718144

>>4718126
also a super awesome website is wolfram

http://www.wolframalpha.com/input/?i=x%5E2


LASKDNFLKAJENFLQEWNJFLAFNA;LSDFNA;LSF

fuck i did it wrong. shit thought i would remember this. sorry op, disregard what i posted, forgot about the different form

>> No.4718152

>>4718131
"i assumed solve meant create a function that models the graph..."
I guess so.

>>4718144
I've seen wolfram, very helpful.
BTW, what wrong?

>> No.4718155

>>4718111
Sorry for the delay.

20. x^2 +2.3x - 73.5 = 0

>> No.4718156

20. y=73.5+9.8t-4.9t^2
perhaps

>> No.4718160

>>4718152

i messed up terribly. i think i made the same mistake that i did now after so many years (wow the nostalgia of getting yelled at for not getting it right).
i really have no clue. lol i think im going to spend the next hour releaning 9th grade math or ill kill myself.

>> No.4718166

>>4718160
If you making a function from the graph, it should be y = x^2 - 1, that way your "zeroes" are still 1 and -1

>> No.4718173

>>4718160
also (x-1)(x+1)=x^2-1

>> No.4718174

>>4718166
With so many answers floating around I'm confused.
Which is correct?

>> No.4718176

>>4718166
!!!!!!!!!!!!!!!!!!!!!!!!!!!
the way that i did it, of factoring out the zeros before putting it in cartesian form, not the other way around.

i made this same mistake on the quadratics test years ago.

>> No.4718180

>>4718174
>>4718166
^is correct

>> No.4718189

So 18. should be

y= x^2 - 1
y=(x-1)(x+1) -1
x^2

>> No.4718192

>>4718189
the first one sorry

>> No.4718226

Is there anything you don't understand op

>> No.4718238

>>4718226
no thats it, thanks again.

>> No.4718242

>>4718238
come back if you need more help, we dont bite but chew softly