Question

The expression 2(a+b)-8.1 for certain values of a and b.find the value of the following expressions for the same values of a and b: 3(a+b)

Answer 1

Note: Consider the given equation is
`2(a+b)=8.1` instated of
`2(a+b)-8.1`.

Given:

The expression
`2(a+b)=8.1` for certain values of a and b.

To find:

The value of
`3(a+b)` for the same value of a and b.

Solution:

We have,

`2(a+b)=8.1`

Divide both sides by 2.

`(a+b)=(8.1)/(2)`

`(a+b)=4.05`

Multiply both sides by 3.

`3(a+b)=3* 4.05`

`3(a+b)=12.15`

Therefore, the value of
`3(a+b)` is 12.15.