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Complete the square on x2+18x−7
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You are asked to complete the square on x2+18x−7
The exponent of x is 18, so we halve it to get 9.
Squaring this gives 81.
We can write
x2+18x−7=x2+18x−7
The first three terms are a perfect square, so we have
x2+18x−7=(x+9)2−81−7
Leading to
x2+18x−7=(x+9)2−88
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