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October 20, 2014

October 20, 2014

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

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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 9:07pm2 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 9:17pmg(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 9:22pmy-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 9:23pmJust brute force think your way through these problems !!!

- Algebra II -
**Emily**, Thursday, December 18, 2008 at 12:30amOMG 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 1:54am6x^4-15x^3+10x^2-10x+4 divided by 3x^2+2

Please help!!!

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