Question

Simplify:
9a^2/3a+b - b^2/3a+b

Answer 1

the denominator was same, what should u do, first ?

Answer 2

cross out

Answer 3

so, what do u get ?

Answer 4

9a^2-b^2 ?

Answer 5

now, can u factor it ?

Answer 6

???

Answer 7

u must factorise the term of 9a^2-b^2
hint : a^2 - b^2 = (a+b)(a-b)

Answer 8

oops I mean (9+b)(9-b^2)

Answer 9

nopes....
it should be 9a^2-b^2 = (3a+b)(3a-b)

Answer 10

the 3 is from the denominator?

Answer 11

not always...
9a^2-b^2 = (3a)^3 - b^2 = (3a+b)(3a-b)
so, what should u do if the expression becomes