Question

Which value must be added to the expression x^2+12x to make it a perfect-square trinomial?

Answer 1

Add 36. The factored form is
`(x+6)^2`.

Explanation:

A perfect square is a trinomial that factors into the form
`(x+a)^2`. To find the value to add to it divide 20 by 2 and square it.

12/2 = 6

6*6 = 36

This means c=36. The factored form is
`(x+6)^2`.