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OpenStudy (anonymous):
what must you add to make x^2+18x=-13 a complete square?
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OpenStudy (anonymous):
by adding 36?
OpenStudy (anonymous):
68
OpenStudy (anonymous):
by adding 68
OpenStudy (anonymous):
wouldnt it be 81
OpenStudy (anonymous):
it becomes (x+9)^2
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OpenStudy (anonymous):
x^2+18x+13=0 (x-9)^2+13-9^2 =0 hence it should be 9^2 which is 81
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