Question

If xsquared+ysquared=57 , xy=3 . find the value of 3(x+y)squared

Answer 1

189

Explanation:

If you mean this, my answer is 3x63= 189

`{x}^(2) + {y}^(2) = 57 \\ xy = 3`

`{x}^(2) + {y}^(2) + 2xy = 57 + 2 * 3`

`{(x + y)}^(2) = 63`

`3 {(x + y)}^(2) = 3 * 63 = 189`