Question

Which value is needed to create a perfect square trinomial from the expression x2 + 8x + _____?

Answer 1

To solve this problem, divide 8 by 2 and then square the product.

$x^2 + 8x$
$\frac{8}{2} = 4$
Square 4
$4^2 = 16$
Answer = $x^2 + 8x + 16$