Mathematics
Grade6
Easy
Question
What is the value of the expression x1 + 5x + 3 where the value of x is 5?
- 28
- 33
- 100
- 20
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: 28
The given expression is x1+ 5x + 3
There is one variable in the above expression. The variable is: ‘x’. Value assigned to the variable is x = 5. We have to substitute this value and find the final value of the expression.
There are two terms in the above expression. The first term is ‘x1'. It means x is taken one time.
The second term is ‘5x’. It means variable x is multiplied by constant 5.
Third term is constant.
We have to first substitute the value and perform the required operations.
To substitute the value, we have to replace x by 5. After substituting the value, we will get the following equation:
x1+ 5x + 3 = x + 5x + 3
x1+ 5x + 3 = (5) + 5(5) + 3
x1+ 5x + 3 = 5 + 25 + 3
x1+ 5x + 3 = 33
Therefore, the value of equation is 33.
So option (b), which is ‘33’ is the right option.
We have to be careful about power of variables.
