Question

If $x=5$, then find the value of the following algebraic expression.

$x^2+4x$

Answer 1

We have $x^2+4x$

Now substitute the value of $x=5$

$$\begin{gathered} 5^2+4\left(5\right) \\ \Rightarrow 25+20 \\ \Rightarrow 45 \end{gathered}$$

Hence the value of the expression is $45$