Question

Complete the square for each expression. Write the resulting expression as a binomial squared.

x^2 - 9x + ?

Answer 1

Take 1/2 of the b term and square it

In ax^2 + bx + c, the coefficient of x is the b term.

Answer 2

so x^2 -9x=?
x^2=-2*4 1/2*x+?
?=4 1/2^2*x - 81/4

(x-9/2)^2 ◀ right?