Question

What number completes the square x^2+18x+_____

(a).81
(b) .324
(c) .-9
(d).9

Answer 1

(a+b)^2= a^2 +2ab+b^2

First you divide 18 by 2 which equals to 9

To complete the square multiply that number by itself
9^2=81

So the correct choice is A

Answer 2

Explanation:

a) 81 is the answer of your question

hope it is helpful to you