simplify, show steps.
= (2sqrt(5))^2 + 2(2sqrt(5))(3sqrt(7)) + (3sqrt(7))^2 (using the formula (a+b)^2 = a^2 + 2ab + b^2) = 4(5) + 2(2)(3)(sqrt(5))(sqrt(7)) + 9(7) = 20 + 12sqrt(35) + 63 = 83 + 12sqrt(35)
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