Question

calcule o valor da expressao (2i - 5 ) ao cubo

Answer 1

(2i - 5)^3
(2i - 5)^2 × (2i - 5)
[(2i - 5)(2i - 5)] × (2i - 5)
[(4i^2 - 10i - 10i + 25)] × (2i -5)
(4i^2 -20i + 25)×(2i - 5)
8i^3 - 40i^2 + 50i - 20i^2 + 100i - 100
8i^3 - 60i^2 + 150i - 100