Question

8. If f(x)=x²-5x+9. Evaluate f (2)-f(-1) +f (3).​

Answer 1

f(x)=x²-5x+9

f(2)= (2)²-5(2)+9

=4-10+9

f(2)=3

f(-1)= (-1)²-5(-1)+9

1+5+9

f(-1)=15

f(3)=3²-5(3)+9

9-15+9

f(3)=3

f(2)-f(-1)+f(3)=3-15+3

=-9