Finding The Value Of An Expression

1. Expressions with One Variable

If we know the value of the variable in the expression then we can easily find the numerical value of the given expression.

Example

Find the value of the expression 2x + 7 if x = 3.

Solution

We have to put the value of x = 3.

2x + 7

= 2(3) + 7

= 6 + 7

= 13

2. Expressions with two or more variables

To find the value of the expression with 2 variables, we must know the value of both the variables.

Example

Find the value of y2 + 2yz + z2 if y = 2 and z = 3.

Solution

Substitute the value y = 2 and z = 3.

y2 + 2yz + z2

= 22 + 2(2) (3) + 32

= 4 + 12 + 9

= 25

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