a) sqrt(81) + 5 = 9 + 5 = 14
b) 3sqrt(36) + 5 * root(-64, 3) = 3 * 6 + 5 * -4 = 18 - 20 = -2
c) (4sqrt(3))^2 = (4 * √3)^2 = 16 * 3 = 48
d) -3sqrt(15) * 2sqrt(15) = -6 * 15 = -90
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a) sqrt(81) + 5 = 9 + 5 = 14
b) 3sqrt(36) + 5 * root(-64, 3) = 3 * 6 + 5 * -4 = 18 - 20 = -2
c) (4sqrt(3))^2 = (4 * √3)^2 = 16 * 3 = 48
d) -3sqrt(15) * 2sqrt(15) = -6 * 15 = -90