Answer
a. -3, b. 9, c. -5
Work Step by Step
We are given the function $f(x)=3x^{2}+x-5$. In order to find the specified values, we can plug the values into the function and solve.
a. $f(-1)= 3(-1)^{2}+(-1)-5=3\times(-1\times-1)+(-1)-5=(3\times1)-1-5=(3)-1-5=3-1-5=-3$
b. $f(2)= 3(2)^{2}+(2)-5=3\times(2\times2)+(2)-5=(3\times4)+2-5=(12)+2-5=12+2-5=9$
c. $f(0)= 3(0)^{2}+(0)-5=3\times(0\times0)+(0)-5=(3\times0)+0-5=(0)+0-5=0+0-5=-5$