Question

2. Fie f:R → R, f(x) = 3x -1. Calculați f(-1) + f(0) + f(2).
3. Fie f: RR, f(x)= x+2. Calculați f(0) f(2). f(4).
4. Fie f: R R. f(x) = 5x -2. Calculați f(-1). f(1). f (3). ​

Answer 1

Explicație pas cu pas:

2.

f(-1) + f(0) + f(2) = 3×(-1) - 1 + 3×0 - 1 + 3×2 - 1 = - 3 - 1 + 0 - 1 + 6 - 1 = - 4 - 1 + 5 = - 5 + 5 = 0

3.

f(0)×f(2)×f(4) = ( 0+2)× ( 2+2) × ( 4+2) = 2×4×6 = 48

4.

f(-1)×f(1)×f(3) = [5×(-1) - 2] × [5×1 - 2] × [ 5×3 - 2] = (-5-2)× ( 5-2) × ( 15 - 2) = - 7 × 3 × 13 = - 21 × 13 = - 273