Quantitative Aptitude • Algebra
a² - b² Formula
basic Level
Formula
a² - b² = (a+b)(a-b)
Explanation
Difference of squares can be factored as product of sum and difference.
Example
100 - 49 = (10+7)(10-7) = 17 × 3 = 51
Quick Trick & Mnemonic
QUICK TRICK: For any two consecutive even numbers: 10² - 8² = (10+8)(10-8) = 18×2 = 36