Question

If x^2-5x+1 is the equation then find the value of f(2)-f(1)+f(1/3)

Answer 1

If  x^2-5x+1  is  the equation then find the value of  

f(2) - f(1) + f(1/3)

f(x) = x^2-5x+1  

put f(2) means x is equal to 2

f(2)=2²-5.2+1 = 4 – 10 + 1 = -5

put f(-1) means x is equal to -1

f(-1)=(-1)²-5.(-1)+1=7

put f(1/3) means x is equal to 1/3

f(1/3)=(1/3)²-5(1/3)+1=-0.654

so that,  f(2)-f(-1)+f(1/3)

=-5 +7 -0.654

=1.346

So that the final value is -1.346