For example, 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.

2m - 3m = -1m\) which can be written as \(-m\). Simplifying like terms gives: \(2m^2 - m - 3\). Another method for multiplying brackets is to use a grid.