Question 275555
The form is (a+b)(a-b) = a^2 - b^2
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(sq.root of 8 + 5 times sq. root of 12)(sq of 8 - 5 times sq of 12)
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Your Problem:
= (sqrt(8))^2 - 5^2
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= 8 - 25
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= -17
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Cheers,
Stan H.