Question

plz help explain 9x^2-25/3x+5? I will up load a better pic.

Answer 1

The top is a perfect square. Can you figure out a factor of it?

Answer 2

okay. my comp is working slow. srr.

Answer 3

where did the (3x+5) come from?

Answer 4

is that from 9 and 25?

Answer 5

There is a form that you want to memorize so you can recognize it. It's (Ax-B). If both A and B are perfect squares you can factor it to (ax+b)(ax-b) where a and b are the square roots of A and B respectively.

Answer 6

Anywho, it just so happens that (3x-5)(3x+5) equals 9x^2-25

Answer 7

Conveniently one of those pieces cancels with the given denominator

Answer 8

oh okay can I draw it out and you can help me where I;m messing up?

Answer 9

sure