Question

What should be done to x² + 15x in order to create a perfect square?

O add 7.5
O subtract 56.25
subtract 7.5
O add 56.25

Answer 1

add 56.25

Explanation:

To create a perfect square

add ( half the coefficient of the x- term )²

x² + 2(7.5)x + 7.5²

= x² + 15x + 56.25

= (x + 7.5)² ← a perfect square