Question

dada a função f(x) = 3x² + 5x -2 determine: A) f(-2) b) f(1/3) c) f (-2/3)

Answer 1

a) f(-2)= 3.(-2)² + 5.(-2) - 2
= 3. 4 - 10 - 2
= 12 - 12
= 0

b) f(1/3)= 3.(1/3)² + 5.(1/3) - 2
= 3. 1/9 + 5/3 - 2
= 3/9 - 1/3
= 0

c) f(-2/3)= 3.(-2/3)² + 5.(-2/3) - 2
= 3. 4/9 - 10/3 - 2
= 12/9 - 16/3
= -4/3