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What number must you add to complete the square x2 plus 4x equals 5?
Wiki User
∙ 11y ago
Add 4 to both sides.
To complete the square, take half the x coefficient into the bracket:
(x + 4/2)2 = (x + 2)2
= x2 + 4x + 4
Comparing with the original, need to add 4 to both sides of x2 + 4x = 5:
(x2 + 4x) + 4 = (5) + 4
⇒ x2 + 4x + 4 = 9
⇒ (x + 2)2 = 9
Wiki User
∙ 11y ago
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