Question

Dada a função f (x) = 8x + 15, calcule:
a) f(0) – f(3)
b)f(5) - f(10)

Answer 1

Dada a função f (x) = 8x + 15, calcule
a) f(0) – f(3)
IDENTIFICANDO
f(0)
f(x) = 8x + 15
f(0) = 8(0) + 15
f(0) = 0 + 15
f(0) = 15
e
f(3) 
f(x) = 8x + 15
f(3) = 8(3) + 15
f(3) = 24 + 15
f(3) = 39
assim
f(0) = 15
f(3) = 39
f(0) - f(3) = 
15 - 39 =  - 24



b)f(5) - f(10)

identificando
f(5) 
f(x) = 8x + 15
f(5) = 8(5) + 15
f(5) = 40 + 15
f(5) = 55
e

f(10)
f(x) = 8x + 15
f(10) = 8(10) + 15
f(10) = 80 + 15
f(10) = 95

assim
f(5) = 55
f(10) = 95

f(5) - f(10) =
55 - 95 = - 40



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