Question

calcule o valor numerico (4x+3) ao cubo ,para x=-2

Answer 1

Resposta:

Explicação passo-a-passo:

(4x + 3)³ = (4.(-2) + 3)³ = (-8 + 3)³ = (-5)³ = (-5).(-5).(-5) = -125

(i) (5y + 7) + (5y + 7) = 5y + 5y + 7 + 7 = 10y + 14

(ii) (2xy + 3) + (2xy + 3) = 2xy + 2xy + 3 + 3 = 4xy + 6

(iii) (2x -1 ) - (2x - 1) 2x - 1 - 2x + 1 = 0

(iv) [(3x)² - 2/3] - [(-3x)² + 2/3] = [9x² - 2/3] - [9x² + 2/3] = 9x² - 9x² -2/3 - 2/3 = 0 - 4/3 = -4/3