Posted by **Emily** on Wednesday, December 17, 2008 at 8:49pm.

I honestly forgot how to do these type of problems. Can someone help me! Thanks!!

--------------------------------------------------------------------------------------------

24. ( 9x^2 - 4 )/( 3x^2 - 10x - 8 )

31. 2x^2 + 5 = 12x

39. Find the maximum value of g(x) = -4x^2 + 16x - 15

42. Graph y-9 = -2(x+3)^2

- Algebra II -
**Damon**, Wednesday, December 17, 2008 at 9:02pm
( 9x^2 - 4 )/( 3x^2 - 10x - 8 )

well the numerator is difference of two squares so factor

(3x-2)(3x+2)

now I bet one of those is a factor of the denominator

(3x - 2)(x+4) no

(3x+2)(x-4) yes

so we really have

(3x+2)(3x-2) / (3x+2)(x-4)

which is

(3x-2) / (x-4)

- Algebra II -
**Damon**, Wednesday, December 17, 2008 at 9:07pm
2 x^2 - 12 x + 5 = 0

I can not factor that, sure it is not 11 x?

If not a typo, use quadratic equation

x = [ -b +/- sqrt(b^2-4ac)] / 2a

- Algebra II -
**Damon**, Wednesday, December 17, 2008 at 9:17pm
g(x) = -4x^2 + 16x - 15

parabola

g is - for bi + or - x so upside down (sheds water)

Find the vertex.

4 x^2 - 16 x + 15 = -g

x^2 - 4 x = (-g-15)/4

x^2 - 4 x + 4 = -g/4 - 15/4 + 16/4

(x-2)^2 = (1/4) (-g +1)

AT VERTEX x = 2, g = +1

so max at (2,1)

- Algebra II -
**Damon**, Wednesday, December 17, 2008 at 9:22pm
y-9 = -2(x+3)^2

pretty much the same as the last one

same both sides of x = -3 so that is the vertical axis of symmetry

vertex at (-3,9)

when x gets big, y gets small, so sheds water

when y = 0

9/2 = (x+3)^2

x + 3 = +/- 3 /sqrt 2

x = -3 +/- 3/sqrt 2 is where he zeros are

- Algebra II -
**Damon**, Wednesday, December 17, 2008 at 9:23pm
Just brute force think your way through these problems !!!

- Algebra II -
**Emily**, Thursday, December 18, 2008 at 12:30am
OMG you are FREAKIN AWESOME for helping me out with these problems!!!!!! With your thorough explanations it all came back to me I thank you SOOOOOO MUCH!!!!!!

- Algebra II -
**Mike**, Friday, March 30, 2012 at 1:54am
6x^4-15x^3+10x^2-10x+4 divided by 3x^2+2

Please help!!!

## Answer This Question

## Related Questions

- 9th grade algebra (factoring with quadratic) - Can you check the following ...
- Algebra - almost done with Algebra...help! 2 3x – 6(2x – 0.055) = 10x + 0.515 I ...
- Algebra 1 - 1) what is the simplified form of (x-2)(2x+3)? Use the distributive...
- algbrea - 3x-5(3x-7)= 2(x+9) + 45 3x-15x+35= 2x+18 +45 -12x + 35 = 2x+63 -12x -...
- 9th grade algebra (completing square) - Can you check the following? A1. (2x + 3...
- Urgent Math please check - Very Important I can get someone to check these for ...
- Polynomial- Doublecheck2 - I asked this earlier, but I didn't get an answer. I'm...
- math - Can someone please help me with these few problems here? Find the holes ...
- algebra2 - 1/3 - 5/6 = 1/X SOLVE 1/3 - 5/6 = 1/X Let's remove the denominators ...
- Math - Can someone please check my answers below for accurateness? The ...

More Related Questions