Question

valor numerico, 15 pontos

Answer 1

a) 3.(x-8) =
    3.(12-8)=
     3.4 = 12

b) x³-x²-2x
    -2³ + 2² - 2(-2) =
    -8 + 4 + 4 = 0

Answer 2

a)
x = 12

= 3.(x - 8)
= 3.(12 - 8)
= 3.4
= 12
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b)

x = - 2

= x³ - x² - 2x
= (-2)³ - (-2)² - 2.(-2)
= - 8 - (4) + 4
= - 8 - 4 + 4
= - 8 + 0
= - 8