Question

Evaluate the following.

$9x^2+3x÷2+4$ for $x=5$

Answer 1

Finding the value of the algebraic expression

Substituting $x=5$ in the expression we get,

$$\begin{gathered} 9x^2+3x÷2+4=9{\left(5\right)}^2+3\left(5\right)÷2+4 \\ =9\times 25+15÷2+4 \\ =225+7.5+4 \\ =236.5 \end{gathered}$$

Hence, the value of the algebraic expression at $x=5$ is $236.5$