Shortcut Formulas/Formulas for Competitive exams like TALATI, SSC, GPSC, IBPS, UPSC and Bank Exams....
♦1. (a+b)² = a² + b² + 2ab
♦2. (a-b)²=a² + b² - 2ab
♦3. a² - b²= (a - b)(a + b)
♦4. a³ - b³= (a-b)(a² + ab + b²)
♦5. a³ + b³= (a+b)(a² - ab + b²)
♦6. (a + b)² = (a - b)² +4ab
♦7. (a - b)² = (a + b)² -4ab
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