Question

4) Seja A = x³y² - 2xy2 e B = -2xy2 + 3x³y, determine 2A + 3B, sabendo que x = 2 ey=1







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Answer 1

x = 2 B = -2xy2

y = 1 B = -2.(2).1.2

 B = -4..1.2

A = 2³ . 1² B = -8

A = 2.2.2.1 2A -

A = 8 2.8 - 8

 16 - 8 = 8

Resposta = 8