Question

Dada a função f(x)=5x-8, calcule:

A)f(2)
B)f(0)
C)(-10)
D)5f(-1)+3f(3)+5f(0)

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Answer 1

a) f(2) = 5(2) - 8

f(2) = 10 - 8

f(2) = 2

b) f(0) = 5(0) - 8

f(0) = 0 - 8

f(0) = - 8

c) 5f(-1) + 3f(3) + 5f(0)

= 5 [ 5(-1) - 8 ] + 3 [ 5(3) - 8 ] + 5 [ 5(0) - 8 ]

= 5 [ - 5 - 8 ] + 3 [ 15 - 8 ] + 5 [ 0 - 8 ]

= 5 [ - 13 ] + 3 [ 7 ] + 5 [ - 8 ]

= - 65 + 21 - 40

= - 105 + 21

= - 84