Question

What should be done to x^2-8xto create a perfect square

a. add 4
b. subtract 4
c. subtract 16
d. add 16

Answer 1

d. add 16

Explanation:

Take half of the x-term coefficient and square it then add it to the polynomial.

You have x² - 8x

The x-term coefficient is -8.

Half of -8 is -4.

Square -4 to get 16.

Answer: add 16