Question 186299
f(x)=x^2 + 18x + 77 
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Complete the square on the x-terms:
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y = x^2 + 18x + (18/2)^2 + 77 - (18/2)^2

y = (x+9)^2 + 77 - 81

y = (x+9)^2 -4
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Cheers,
Stan H.