Question

Simplify the expression 10 a -7 + 9 a . then evaluate the expression if a = 2

Answer 1

We have the expression:

`10a-7+9a`

We can simplify it by grouping the similar terms 10a and 9a:

`\begin{gathered} 10a-7+9a \\ 10a+9a-7 \\ (10+9)a-7 \\ 19a-7 \end{gathered}`

When a=2, we can replace a with the value 2 and calculate:

`\begin{gathered} 19a-7 \\ 19(2)-7 \\ 38-7 \\ 31 \end{gathered}`

Answer: The simplified expression is 19a-7.

The result of the expression when a=2 is 31.