What number needs to be added to both sides of the equation to complete the square? x^2−9x=8 x^2 − 9x + = 8 +

Either the fraction 81/4 or the decimal number 20.25 (which is equivalent to that fraction). The answer format will depend on what your teacher wants.

Step-by-step explanation:

The x coefficient is -9. When you cut that in half you get -9/2. Squaring this fraction leads to (-9/2)^2 = 81/4 = 20.25