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OpenStudy (anonymous):
can you simplify - sqrt 40 + sqrt 90 if 40 is negative???
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OpenStudy (stamp):
sqrt(40) = 2sqrt(10) - sqrt(40) = - 2sqrt(10) sqrt(90) = 3sqrt(10) - sqrt(40) + sqrt(90) = - 2sqrt(10) + 3sqrt(10) = 1 sqrt(10) = sqrt(10)
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