Ashtyn Duncan

2023-03-11

How to find the value of $f\left(\frac{1}{2}\right)$, if $f\left(x\right)=3x-4$?

Explanation:
Substitute $\frac{1}{2}$ for each occurrence of $x$ in the function $f\left(x\right)$ and determine the outcome:
$f\left(x\right)=3x-4$ becomes:
$f\left(\frac{1}{2}\right)=\left(3×\frac{1}{2}\right)-4$
$f\left(\frac{1}{2}\right)=\frac{3}{2}-4$
$f\left(\frac{1}{2}\right)=\frac{3}{2}-\left(\frac{2}{2}×4\right)$
$f\left(\frac{1}{2}\right)=\frac{3}{2}-\frac{8}{2}$
$f\left(\frac{1}{2}\right)=\frac{3-8}{2}$
$f\left(\frac{1}{2}\right)=-\frac{5}{2}$

tolosanasdpr

Given solution
Sub $x=\frac{1}{2}$ into the function,
$f\left(\frac{1}{2}\right)=3\left(\frac{1}{2}\right)-4$
$f\left(\frac{1}{2}\right)=\frac{3}{2}-4$
$f\left(\frac{1}{2}\right)=-\frac{5}{2}$ or $-2.5$

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