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Factoring Rules

Algebra formulas for factoring. 1. x2 – (r + s)x + rs = (x – r)(x – s)
 2. x2 + 2ax + a2 = (x + a)2andx2 – 2ax + a2 = (x – a)2 3. Difference of squares:a2 – b2 = (a – b)(a + b) 4. Difference of cubes:a3 – b3 = (a – b)(a2 + ab + b2) 5. a4 – b4 = (a – b)(a3 + a2b + ab2 + b3) = (a – b) < a2(a + b) + b2(a + b) > = (a – b)(a + b)(a2 + b2) or, more sindicate, a4 – b4 = (a2 – b2)(a2 + b2) = (a – b)(a + b)(a2 + b2) 6. a5 – b5 = (a – b)(a4 + a3b + a2b2 + ab3 + b4) 7. an – bn = (a – b)(an – 1 + an – 2b + an – 3b2 + ··· + abn – 2 + bn – 1) 8. Sum of cubes:a3 + b3 = (a + b)(a2 – ab + b2) 9. a5 + b5 = (a + b)(a4 – a3b + a2b2 – ab3 + b4) 10. a7 + b7 = (a + b)(a6 – a5b + a4b2 – a3b3 + a2b4 – ab5 + b6) 11. If n is odd, thenan + bn = (a + b)(an – 1 – an – 2b + an – 3b2 – ··· + a2bn – 3 – abn – 2 + bn – 1) 12.You are watching: A^4-b^4See more: How To Tie Down A Motorcycle On A Trailer Without A Chock S, How Do You Tie Down A Motorcycle Without A Chock Sum of squares:a2 + b2 = (a – bi)(a + bi)Note:a2 + b2does not aspect making use of real numbers. 13. 