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

$\begin{gathered} (2\times9a)+(2\times3)+(-1\times11a)+(-1\times-2) \\ 18a+6-11a+2 \end{gathered}$

now group and operate

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

the equivalent expression is 7a+8