in the expression \(3(m + 7)\) both \(m\) and 7 must be multiplied by 3: \(3(m + 7) = 3 \times m + 3 \times 7 = 3m + 21\). Expanding brackets involves using the skills of simplifying algebra.

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in the expression \(3(m + 7)\), multiply both \(m\) and 7 by 3, so: \(3(m + 7) = 3 \times m + 3 \times 7 = 3m + 21\). Expanding brackets involves using the skills of simplifying algebra.