Free · Class 8–10 · 5 worksheets · answer keys · practise online · set 41
Algebra formulas sheet — identities, with practice questions
Free algebra formulas sheet: (a + b)², (a − b)², (a + b)(a − b), (a + b)³ and more, with printable practice — expand, factorise and use identities to calculate, with answers.
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(a + b)² = a² + 2ab + b² · (a − b)² = a² − 2ab + b² · (a + b)(a − b) = a² − b²
(x + a)(x + b) = x² + (a + b)x + ab · (a + b)³ = a³ + 3a²b + 3ab² + b³ · (a − b)³ = a³ − 3a²b + 3ab² − b³
a³ + b³ = (a + b)(a² − ab + b²) · a³ − b³ = (a − b)(a² + ab + b²) · (a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ca
(a + b)² = a² + 2ab + b², (a − b)² = a² − 2ab + b² and (a + b)(a − b) = a² − b² — learn these three first; the others build on them.
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