What number must you add to complete the square? X^2 +12x=40

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asked Apr 17, 2018 18.9k views

2 Answers

Jagzviruz · Answer 1 · 2018-04-24T08:23:57+0000

You halve the linear coefficient, square it, then add that to both sides. In this case:

(12/2)^2=6^2=36 so you would add 36 to both sides

x^2+12x+36=76 so that the left side is now a perfect square

(x+6)^2=76

What number must you add to complete the square? X^2 +12x=40

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