Question

Examples 4 and 5 If$f\left(x\right)=-2x-3$ and$g\left(x\right)=x^2+5x,$ find each value. (P. 50)

$f\left(0\right)-7$

Short answer

The value of the function$f\left(0\right)-7$ is $-10$.

Step-by-step solution

Step 1. Interpreting of function.

$f\left(0\right)$Indicates the value of function$f\left(x\right)$ at$x=0$

Step 2. Apply substitution method.

Substitute$x=0$ into the function$f\left(x\right)$

$\begin{array}{l}f\left(0\right)=-2\left(0\right)-3\\ f\left(0\right)=-3\end{array}$

Step 3. Further calculation.

$\begin{array}{l}f\left(0\right)-7=-3-7\\ f\left(0\right)-7=-10\end{array}$

Therefore, the value of the function$f\left(0\right)-7$ is $-10$.