Question

If $x=4$ ,find the value of $5x$ .

Answer 1

Hint: Here in this question we have been given that $x=4$ and we have been asked to find the value of $5x$ . For answering this question we will substitute the value of $x$ in the given expression first and then simplify it.

Complete step by step answer:
Now considering from the question we have been given that $x=4$.
We have been asked to find the value of $5x$ .
For answering this question we will substitute the value of $x$ in the given expression first and then simplify it.
Now by substituting the value of $x$ in the given expression $5x$ we will have $\Rightarrow 5\left( 4 \right)$ .
Now we will simplify the above expression by performing simple algebraic operations.
By simplifying the above expression we will have $\Rightarrow 20$ since we know that $5\times 4=20$ .
Therefore we can conclude that the value of $5x$ is $20$ when $x=4.$

Note: This is a very simple and easy question and can be answered in a short span of time. Very few mistakes are possible in questions of this type. We should be very careful with the algebraic simplifications that we are performing in between the steps during solving the question. Someone can make a mistake like substituting $x=5$ instead of $x=4$ which will lead us to end up having $25$ which is a wrong answer. Therefore this implies that we should be careful with the calculations and simplifications that we are going to perform in between the process of solution.