Question

factor: 64x^2-81

Answer 1

hint: difference of two squares
\[\huge \implies (8x)^2 - (9)^2\]

Answer 2

difference of two squares formula is \[a^2 - b^2 = (a+b)(a-b)\]
does that help?

Answer 3

write as
(8x)^2-(9)^2
now use
\[\Huge a^2-b^2=(a+b)(a-b)\]

Answer 4

i still don't understand.