since (a+b)^2 = a^2 + 2ab + b^2, we have
(2√5+3√7)^2
= (2√5)^2 + 2(2√5)(3√7) + (3√7)^2
= 4*5 + 12√5√7 + 9*7
= ...
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Simplify(2√5+3√7)^2
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