Question

if f(x)=x^(2)-5x+1 then the value of f(2)-f(-1) is

Answer 1

=f(-2)-f(-1)

=-5-(-3)

=-5+3

=-2

Answer 2

-12

Step-by-step explanation:

given function f(x) = x² - 5x + 1

now f(2) = 2² - 5(2) + 1. [putting x = 2]

= 4 - 10 + 1

= 5 - 10

f(2) = -5

similarly f(-1) = (-1)² - 5(-1) + 1. [putting x = -1]

= 1 + 5 + 1

f(-1) = 7

f(2) - f(-1) = -5 -7 = -12