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What number must be added to the expression below to complete the square? x^2-18x a: -9 b: 9 c: 81 d: -81

What number must be added to the expression below to complete the square? x^2-18x a: -9 b: 9 c: 81 d: -81
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5 votes
What number must be added to the expression below to complete the square?

x^2-18x
a: -9
b: 9
c: 81
d: -81

asked
User Cristhian
by
8.3k points

2 Answers

5 votes

Answer:

c

Explanation:

answered
User Kovo
by
7.7k points
5 votes
The answer is C. You would take -18 and divide by two and get -9. Then square this to get 81. That is your answer, hope this helps!
answered
User James Ikubi
by
8.3k points
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