Practicing Success
Practicing Success
CUET Preparation Today
If 7x2 + y2 = 67, xy = 6 (x, y > 0) find 2x3 + y3 + 8. |
70 80 85 49 |
70 |
By Putting x = 3 and y = 2 These values are satisfying the equations: ⇒ 7x2 + y2 = 67 ⇒ 7(3)2 + (2)2 = 67 ⇒ 67 = 67 Put these values and find: ⇒ 2x3 + y3 + 8 = 2(3)3 + (2)3 + 8 = 54 + 8 + 8 = 70 |
