1.

If x + y = 20 and xy = 84, then (x)2 + (y)2 = ? (a) 232 (b) 400 (c) 128 (d) Cannot be determined (e) None of these

Answer»

(a) Given, x + y = 20 and xy = 84
x2 + y2 = (x + y)2 – 2xy
= (20)2 – 2 × 84
= 400 – 168 = 232



Discussion

No Comment Found