Rational expressions and equations

[latresa31s]

Here's a problem I am working on and could use some help.

15^2 + 16x + 4
4 - 25x^2

= ( 15 + 4)(4 +x)
4 - 25x

so I stop cause it didn't look right.

 

[ting]

I think you have.

15x^2 + 16x + 4
______________
4 - 25x^2


Factor the numerator and the denominator. The denominator is the difference of two squares.


(5x + 2)(3x + 2)
______________
(2 - 5x)(2 + 5x)


Simplify


3x + 2
_____
2 - 5x

 

[latresa31s]

Thank you so much

 

[latresa31s]

is this one right

x^2 – 8x + 15
x^3 – 5x^2 + 6x


=(x-3)(x-5)
x(x^2+2)(x-3)
x+5
x(x^2+3)

 

[Gene]

Your factoring is awry.
<u>x^2 – 8x + 15</u>
x^3 – 5x^2 + 6x

<u>(x-3)(x-5)</u>
x(x-2)(x-3)

<u>x-5</u>
x(x-2)