Question

The value of the expression $a^2+3a-5$ when $a=2$ is

• A. $5$
• B. $15$
• C. $-5$

Answer 1

The correct option is A

$5$

We have an expression $a^2+3a-5$ and $a=2$

So, replacing $a$ by $2$ we have

$$\begin{gathered} a^2+3a-5={\left(2\right)}^2+\left(3\times 2\right)-5 \\ =4+6-5 \\ =10-5=5 \end{gathered}$$

Thus, the required value is $5$

Hence, option(A) is correct.