Question

valor numerico da expressao 
a³+b³-2a²+4ab+1, para a=2 e b=-3

e b) xy-x²/√y

Answer 1

$a^3 + b^3 -2a^2 +4ab + 1\\\\\\\ a=2\\\ b=3\\\\\\\\\ 2^3 +3^3 - 2*2^2 + 4*2*3 + 1\\\\\ 8+27-8+24 + 1 = 52$