Kelly is solving x^2 - 4x = 7 by completing the square. What number will Kelly add to both sides of the equation? x^2 - 4x + ___ = 7 + ____

asked Jan 4, 2019 219k views

2 votes

Kelly is solving x^2 - 4x = 7 by completing the square. What number will Kelly add to both sides of the equation?

x^2 - 4x + ___ = 7 + ____

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4 votes

To complete the square, you add
(b)/(2)^2 to both sides

so
(4)/(2)^2

2^2

x^2 - 4x + 4=7 + 4

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