Question

factorise the following using the identity a2-b2 =(a+b )(a-b)
1.9x^2-1
2.x^2/9-y^2/25
3.y^2-y/9
4.x^2/25-625
5.x^2/8-y^2/18
6.4x^2/9 -9y^2/16
7.x^2y/9-xy^2/16
8.1/36 a^2 b^2- 16/49 b^2c^2
9.a^2-(a-b)^4
10.x^4-1
if you sove this you are a brilliant!​

Answer 1

Answer:

9x^2 -1

(3x)^2-(1)^2

(3x+1)(3x-1)