Question

Which of the following shows the correct first step to solve x^2-18x=-45

A x^2 - 18x + 18= -45 + 18
B. x^2 - 18x + 9 = -45 + 18
C. x^2 -18x + 81 = -45
D. X^2 -18 + 81 = -45 + 81

Answer 1

D, X^2 -18 + 81 = -45 + 81

Explanation:

it is complating squer method that used for solving x in a quadratic equetion . in this step you will add

(y/2)^2 if y is the cofitient of x .