Question

x-y=13 and xy=30.Find x+y

Answer 1

Answer:

17 or -17

Step-by-step explanation:

Given,

x - y = 13

xy = 3

Just use the identity

(x + y)² = (x - y)² + 4xy

(x + y)² = (13)² + 4(30)

(x + y)² = 169 + 120

(x + y)² = 289

(x + y) = ±17

Thus  x + y = 17 or -17

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