Question

Write the equivalent expression: 2 (9a + 3) – (11a - 2)

Answer 1

`2(9a+3)-(11a-2)`

first solve the parenthesis multiplying by each coefficient

`\begin{gathered} (2*9a)+(2*3)+(-1*11a)+(-1*-2) \\ 18a+6-11a+2 \end{gathered}`

now group and operate

`\begin{gathered} (18-11)a+(6+2) \\ 7a+8 \end{gathered}`

the equivalent expression is 7a+8