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The first step is to multiply out all brackets. Them you add together (or subtract) like terms: these are terms which have the same variables [to the same powers].

Thus 2(3x + 5) + (x + 7)(2x - 3)

Multiply out the brackets to give:

6x + 10 + 2x^2 - 3x + 14x - 21

Rearrange so that like terms are grouped together:

2x^2 + 6x - 3x + 14x + 10 - 21

Combine like terms:

2x^2 + 17x - 11

The second stage - rearranging - is not necessary once you are experienced but is advisable in the early days.

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Q: How do you simplify an expression with variables?
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