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OpenStudy (anonymous):
What is the exact value of the expression sqrt 72 − sqrt 8 +sqrt 128 ? Simplify if possible.
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OpenStudy (gw2011):
sqrt 72=(sqrt 36) (sqrt 2)=6 sqrt 2 sqrt 8=(sqrt 4) (sqrt 2)=2 sqrt 2 sqrt 128=(sqrt 64) (sqrt2)=8 sqrt 2 6 sqrt 2 - 2 sqrt 2 + 8 sqrt 2 = 12 sqrt 2
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