Question

If using the method of completing the square to solve the quadratic equation

x2 + 3x + 21 = 0, which number would have to be added to "complete the
square"?

Answer 1

Answer:-18.75

Step-by-step explanation:x^2+3x+21-18.75=x^2+3x+2.25=

(x+1.5)^2=-18.75

Answer 2

8

Explanation: