Question

Complete the square for the expression. Write the resulting expression as a binomial squared.
x2 - 9x + _____

Answer 1

(x-4,5)^2 will give you x^2 - 9x + 81/4 (or 20.25, depending on how you want to write it)

Answer 2

ax²+bx+c
To complete the square (find c) divide b by 2 and square that number.
x² - 9x + ____?
(9/2)² = 81/4
= x² - 9x + 81/4
= (x-9/2)²