Practicing Success
Practicing Success
CUET Preparation Today
If x + y = 27, x2 + y2 = 425 Find (x - y)2 |
11 121 242 132 |
121 |
Formula: (x + y)2 = x2 + y2 + 2xy ⇒ (27)2 = 425 + 2xy ⇒ 729 - 425 = 2xy ⇒ 2xy = 304 Now, ⇒ (x - y)2 = x2 + y2 - 2xy ⇒ (x - y)2 = 425 - 304 = 121 |
