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OpenStudy (anonymous):
18 / (4-√7) Simplify the expression. I've already passed the steps of multiplying the conjugate... I need help past that. Whatever I am doing is incorrect
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OpenStudy (kc_kennylau):
Multiply the denominator and the numerator by \(4+\sqrt7\)
OpenStudy (anonymous):
I've done that and I got 72 + 18 square root of 7 / 9 but then on my answer sheet it is -18
OpenStudy (kc_kennylau):
Then your answer sheet is wrong http://www.wolframalpha.com/input/?t=crmtb01&f=ob&i=18%2F(4-sqrt7)
OpenStudy (anonymous):
Thanks
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