Activity #2: Evaluation of Functions

Evaluate the function  $f\left(x\right)=x^2+4x+1$  when  $x=-2$  .

• 0

• -1

• -2

• -3

How do we evaluate a function?

• by finding the value to be substituted to the variable

• by substituting the given value of the variable and simplifying

• by solving for the value of the variable that will make the function equal to 0

• by graphing the function on the Cartesian plane

If  $f\left(x\right)=m+5q$  ,where  $m=1$  and $q=5$  find  the value of  $f\left(x\right)$  

• 10

• 11

• 26

• 30

 $h\left(x\right)=\frac{-2x+5}{4}$ , find  $h\left(\frac{3}{2}\right)$  

• 2

•  $\frac{3}{5}$  

•  $\frac{1}{4}$  

•  $\frac{2}{4}$  

 $f\left(x\right)=\left|2x-4\right|$ , find  $f\left(-7\right)$  

• -18

• 18

 $g\left(x\right)=\frac{-5x+2}{3}$  , find  $h\left(1\right)$  

•  $-1$  

•  $\frac{2}{3}$  

•  $-\frac{7}{3}$  

• 0

 $f\left(x\right)=\sqrt{x-6}$  , find  $f\left(15\right)$  

• 9

•  $\sqrt{3}$  

•  $3$  

• 0

 $p\left(x\right)=\frac{4x^2+5x}{2}$  , find  $g\left(3\right)$  

•  $\frac{1}{2}$  

•  $\frac{51}{2}$  

•  $\frac{3}{4}$  

•  $\frac{2}{3}$  

 $k\left(x\right)=x^3+5x^2+4x+4$  find  $f\left(-1\right)$  

• 1

• 2

• 3

• 4

 $h\left(x\right)=3^x-2x+1$  , find  $h\left(2\right)$  

• 6

• 9

• 0

• 4