Question

simplify x+7/x^2+4x-21

Answer 1

Factor the denominator.

Answer 2

O great saifoo, how do you factor ?

Answer 3

Do you know how to factor?
@swimmergirl

Answer 4

Look at the numerator. That gives you a clue as to what one factor of the denominator might be and then you can figure out the other factor.

Answer 5

-4x^3+21x+147/21x^2

Answer 6

oh gosh I don't know how to factor....

Answer 7

http://www.youtube.com/watch?v=X7B_tH4O-_s

Answer 8

Factorise x^2+4x-21:
x^2+4x-21
= x^2 -3x + 7x -21
= x(x-3) + 7(x-3)
= (x+7)(x-3)

Do you understand?