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: −0.5(a+b)

Answer 1

Answer:

Interpreting as: 2(a+b)=-8.1

Input:

2 (a + b) = -8.1

Answer 2

In Given the expression

                               2( a + b) = 8.1  ..........................(1)

now divide both sides of the first equation by 2 ,

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

                        (a + b) = 4.05

expression    -0.5(a + b) ................(2)

 simply put the value of (a + b) in (2),

                          - 0. 5( 4.05) = -0.5 * 4.05

                                          = 2.025

Value of expression is 2.025.

What is a expression in maths?

An expression is a set of terms combined using the operations +, – , x .

For example - 4 x − 3 or x 2 – x y + 17 .

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