Question

F(x) = x2 + 4x − 6

Answer 1

Since

$x^2+4x+4=(x+2)^2$

Is a perfect square, we can think of the "-6" at the end as a "+4-10" and we have

$x^2+4x-6 = x^2+4x+4-10 = (x+2)^2-10$

Which is the required form