Math help

Note that this factors into

(9x + 8) (9x + 8) = 0 (A perfect square trinomial)

Can you take it from there???

BreeziBee:

how do I solve: 81x^2+144x+64=0

(a+b) ²
=(a+b)(a+b)
=a ² + 2ab + b ² You need to memorise this!

(9x) ² = 81x ²
8 ² = 64
2*9x*8 = 144x

So like Chris said, this is a perfect square factorisation