Formula sheet — Algebra Essentials

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FORMULA SHEETAlgebra Essentials(a + b)² = a² + 2ab + b²SQUARE(a − b)² = a² − 2ab + b²SQUAREa² − b² = (a + b)(a − b)DIFFERENCE OF SQUARES(a + b)³ = a³ + 3a²b + 3ab² + b³CUBEx = (−b ± √(b² − 4ac)) / 2aQUADRATIC FORMULASₙ = n/2 [2a + (n − 1)d]AP SUMaₙ = a + (n − 1)dAP NTH TERMSₙ = a(rⁿ − 1)/(r − 1)GP SUM, R ≠ 1Check with your textbook before exams.

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