Question

Determine o valor numérico de:

Answer 1

A) 5.(2x - 3)          x = 4
5. (2.4 - 3)
5. (8 - 3)
40 - 15 = 25

b) x³ - x²                x = -3
(-3)³ - (-3)² = -27 - 9 = -36

c) 2x/7 + 1
2.14/7 + 1 = 28/7 + 1 = 4 + 1 = 5

d) 2,8x² + 8x                 x = -6
2,8.(-6)² + 8.(-6) = 2,8.36 - 48 = 100,8 - 48 = 52,8