Question

Considere a função f(x) =3.x2 + 5.x - 4. calcule f(-3), f(-2), f(-1), f(0), f(1), f(2) e f(3)​

Answer 1

f(x) = 3 . x² + 5 . x - 4

f(-3) = 3 . (-3)² + 5 . (-3) - 4

f(-3) = 3 . 9 + (-15) - 4

f(-3) = 27 - 15 - 4

f(-3) = 27 - 19

f(-3) = 8

f(-2) = 3 . (-2)² + 5 . (-2) - 4

f(-2) = 3 . 4 + (-10) - 4

f(-2) = 12 - 10 - 4

f(-2) = 12 - 14

f(-2) = - 2

f(-1) = 3 . (-1)² + 5 . (-1) - 4

f(-1) = 3 . 1 + (-5) - 4

f(-1) = 3 - 5 - 4

f(-1) = 3 - 9

f(-1) = - 6

f(0) = 3 . (0)² + 5 . (0) - 4

f(0) = 3 . 0 + 0 - 4

f(0) = 0 + 0 - 4

f(0) = - 4

f(1) = 3 . (1)² + 5 . (1) - 4

f(1) = 3 . 1 + 5 - 4

f(1) = 3 + 5 - 4

f(1) = 8 - 4

f(1) = 4

f(2) = 3 . (2)² + 5 . (2) - 4

f(2) = 3 . 4 + 10 - 4

f(2) = 12 + 10 - 4

f(2) = 22 - 4

f(2) = 18

f(3) = 3 . (3)² + 5 . (3) - 4

f(3) = 3 . 9 + 15 - 4

f(3) = 27 + 15 - 4

f(3) = 42 - 4

f(3) = 38