Question

Find f(-5) and f(12) for each piecewise function f(x){-4x+3 if x<3{-x^3 If 3<_x<_8{3x^2+1 If x>8The lines go under the inequality lol but please help !

Answer 1

48.

f(-5)

if x<3 f(x)= -4x + 3

Therefore

f(-5) = -4(-5) + 3 = 20 + 3 = 23

f(12)

if x>8 f(x) = 3x² + 1

Therefore:

f(12) = 3(12)² + 1 = 3*144 + 1 = 432 + 1 = 433

50.

f(-5)

if x<-4 f(x) = 2x² + 6x + 4

Therefore:

f(-5) = 2(5)² + 6(5) + 4 = 2*25 + 30 + 4 = 50 + 30 + 4 = 84

f(12)

if x≥12 f(x) = 14

Therefore:

f(12) = 14