Evaluating and Interpreting Function Notation

$f (3)$ means the value of the function when $x = 3 .$ We can calculate this by substituting $3$ for $x$ and evaluate.

f (x) = 3 x^{2} - 2 x + 5

x = 3

f (3) = 3 \cdot 3^{2} - 2 \cdot 3 + 5

CalcPowCalculate power

f (3) = 3 \cdot 9 - 2 \cdot 3 + 5

f (3) = 27 - 6 + 5

AddSubTermsAdd and subtract terms

f (3) = 26

The value of $f (3)$ is 26.

Evaluating and Interpreting Function Notation 1.11 - Solution