Simplify (9)(√5-4√7) (√7+3√5)
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9×(√5-4√7)(√7 +3√5)
= 9 ×(√(5×7) - 4√7×√7 + 3×√5×√5 - 3×4√(7×5))
= 9×(√35 - 28+ 15-12√35)
=9×(-13-11√35)
= -117 - 99√35
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