Mathematics
Grade6
Easy
Question
Find the value of 5x + x if x = - 2
- - 10
- - 12
- 10
- 12
Hint:
This is an algebraic expression. An algebraic expression consists of two components: a variable and a constant. A variable is a quantity that doesn’t have any fixed value. It takes value according to the conditions. It is denoted by the alphabet. A constant is a quantity with a fixed value. In this question, value is assigned to the variable. We have to perform the required operations and find the final value.
The correct answer is: - 12
The given expression is 5x+x.
There is only one variable in the above expression. The value assigned to the variable is -2.
We have to substitute this value, x = -2, and find the final value of the expression.
There are two terms in the above expression. And they are connected using an addition sign. So we have to first substitute the value and perform the required operations.
To substitute the value, we have to replace x by -2. After substituting the value, we will get the following equation:
5x+x = 5(-2)+(-2)
Now we have to first multiply 5 by -2.
On multiplication, we get
5x+x = -10-2
5x+x = -12
Therefore, the value of equation is -12
So option (b), which is ‘-12’ is the right option.
We have tk
We have to be careful about the operations between the variables. The variables take different values according to the different conditions.
