Question

Factor: 4x^2-12x+9=0

Answer 1

Use formula $a^2-2ab+b^2=(a-b)^2$

$4x^2-12x+9 \\(2x)^2-2(2x)(3)+3^2 \\(2x-3)^2$

Answer 2

Tricky Trinomial
4x^2-12x=9
(4x^2-6x)(-6x+9)
2x(2x-3)-3(2x-3)
= (2x-3)^2