Question

X=2+y and
x2+y2=34
find Xy

Answer 1

Answer:

x = 2+y. (Given)

x - y = 2

Square both sides.

(x - y)² = 2²

x² + y² -2xy = 4

As x² + y² = 34, (Given)

34 - 2xy = 4

-2xy = 4-34

-2xy = -30

xy = 15

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