Question

If f is a real valued function defined by f(x) = x 3 + 4x + 3, then find f(1) and f(3).

Answer 1

★Heya★

F(x) = x³ + 4x + 3

put x = 1 To get F(1)

F(1) = (1)³ +4(1) + 3

F(1) = 8

=>

Put x = 2 to get F(2)

F(2) = 2³ + 4 ( 2 ) + 3

F(2) = 19

Answer 2

Answer:

f'(1) = 7

f'(3) = 31

Step-by-step explanation:

In the scenario here,  f is a real valued function with  

f(x) = x³ + 4x + 3

As per formula, d/dx(xⁿ) = n.xⁿ⁻¹

f'(x) = 3x² + 4

f'(1) = 3.1² + 4  

f'(1) = 7

f'(3) = 3.3² + 4  

f'(3)  = 31