Question

Can `y= 4x^2 + 12x + 9` be factored? If so what are the factors ?

Answer 1

`color(green)((2x+3)^2=(2x+3)(2x+3))`

Explanation:

You could use the quadratic formula
or the "AC Method"
but trying out factors of `4` together with factors of `9` has this solution fairly quickly.