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Multiplying brackets $ \big(x \pm a \big)\big(x \pm b \big)$
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Multiplying brackets $ \big(mx \pm a \big)\big(nx \pm b \big)$
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Factorizing expressions

Work slowly and carefully

When multiplying out more complex brackets or multiplying out three of them, it is crucial to work systematically, slowly & carefully. The faster you go, the more mistakes you are likely to make.