Question

Sendo f(x) = x² + 2x, calcule: a) f(-1) b) f(0) c) f(3) d) f(1/3)
Me ajude por favor

Answer 1

Resposta:

a) f(-1) = - 1

b) f(0) = 0

c) f(3) = 15

d) f(1/3) = 7/9

Explicação passo a passo:

f(x) = x² + 2x

a) f(-1)

f(-1) = (-1)² + 2.(-1)

f(-1) = 1 - 2

f(-1) = - 1

b) f(0)

f(0) = 0² + 2.0

f(0) = 0 + 0

f(0) = 0

c) f(3)

f(3) = 3² + 2.3

f(3) = 9 + 6

f(3) = 15

d) f(1/3)

f(1/3) = (1/3)² + 2.1/3

f(1/3) = 1²/3² + 2/3

f(1/3) = 1/9 + 2/3

f(1/3) = 1/9 + 6/9

f(1/3) = (1 + 6)/9

f(1/3) = 7/9