Question

Factor completely. 9x2 – 25

Answer 1

this is difference of 2 squares
can you tell me the square root of 9x2 and 25?

Answer 2

well 25 is 5 and i have no idea about 9x^2

Answer 3

ok 9x^2 = 3x * 3x
its 3x

now we write two square root in parentheses with + in 1 bracket and - in the other
(3x - 5)(3x + 5)

Answer 4

Thanks\

Answer 5

if you expand these you'll see that the terms in x cancel leaving just the 2 squares

Answer 6

yw