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If using the method of completing the square to solve the quadratic equation x^2 - 5x - 18 = 0, which number would have to be added to "complete the square"?
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2 votes
If using the method of completing the square to solve the quadratic equation

x^2 - 5x - 18 = 0, which number would have to be added to "complete the
square"?

User Maroshii
by
3.7k points

1 Answer

2 votes

Answer:

(5/2) ² or 25 /4

Explanation:

x² - 5x - 18 = 0

x² -5x = 18

x² -5x + (5/2)²= 18 + (5/2)²

User Eugene Kuleshov
by
3.1k points
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