Question

If x square + y square = 29 and xy= 10, then value of x+y equals

Answer 1

Step-by-step explanation:

x² + y² = 29, xy = 10

to evaluate x + y

(x + y)² = x² + y² + 2xy

(x + y)² = 29 + 2×10

(x + y)² = 49

therefore x + y = √49 = ±7