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Stuart Douglas · Answer 1 · 2023-12-08T12:51:46+0000

We want to simplify the expression;

$\begin{gathered} 6(5r-11)-1(5-r) \\ \text{Let's open the brackets, we would have} \\ 30r-66-5+r \\ \text{collect like terms to obtain} \\ 31r-71 \end{gathered}$

So, the mistake you made is to forget to multiply the negative r by -1 when expanding.

- 1 x - r = + r

The equivalent expression is ,therefore , 31r - 71

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