Question

Given the function f(x) = 5x^2 - x + 20, find f(3)
A) -20
B)-13
C) 62
D) 64

Answer 1

Given function is f(x)= 5x^2-x+20

f(3) , substitute 3 in place of x

=> f(3)=5(3)^2-3+20

=>f(3)= 45-3+20

=>f(3) = 62

Answer 2

Answer: 62 (choice C)

Work Shown:

f(x) = 5x^2 - x + 20

f(3) = 5(3)^2 - 3 + 20

f(3) = 5(9) - 3 + 20

f(3) = 45 - 3 + 20

f(3) = 42 + 20

f(3) = 62