Question

Se f(x) = 3x² + 6x – 4, então f(1) – f(– 2) é igual a:
a) 28
b) 9
c) 1
d) – 23​

Answer 1

__________

f(x) = 3x² + 6x - 4

_

f(1) = 3(1)² + 6(1) - 4

3 + 6 - 4

3 + 2

5

f(1) = 5

_

f(-2) = 3(-2)² + 6(-2) - 4

3(4) - 12 - 4

12 - 12 - 4

-4

f(-2) = -4

_

f(1) - f(-2)

5 - (-4)

5 + 4

9

Alternativa B ( 9 )

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Att: MarcosPCV

Answer 2

Resposta:

f(x) = 3x² + 6x – 4

f(1) = 3 • 1² + 6 • 1 – 4

f(1) = 3 • 1 + 6 – 4

f(1) = 3 + 2

f(1) = 5

f(x) = 3x² + 6x – 4

f(–2) = 3 • (–2)² + 6 • (–2) – 4

f(–2) = 3 • 4 + (–12) – 4

f(–2) = 12 – 12 – 4

f(–2) = 0 – 4

f(–2) = –4

f(1) – f(–2)

5 – (–4)

5 + 4

9

Alternativa b) ✅