Question

If f(x)=xsquare-5x+7 then evaluate f(2)+f(1/3)-f(-1)

Answer 1

f(x)=x²-5x+7

f(2)=2²-5.2+7=4-10+7=11-10=1

f(-1)=(-1)²-5.(-1)+7=1+5+7=13

f(1/3)=(1/3)²-5(1/3)+7=1/9-5/3+7=49/9

∴, f(2)-f(-1)+f(1/3)

=1-13+49/9

=58/9-13

=-59/9

Answer 2

f(x) = x² - 5x + 7

Find f(2):

f(2) = (2)² - 5(2) + 7 = 1

Find f(1/3):

f(1/3) = (1/3)² - 5(1/3) + 7 = 49/9

Find f(-1):

f(-1) = (-1)² - 5(-1) + 7 = 13

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

Find f(2) + f(1/3) - f(-1)  = 1 + 49/9 - 13 = - 59/9

Answer: - 59/9