Question

It x2 — y2 =15, and x + y =3 then x — y is :

Answer 1

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Answer 2

Answer:

x - y = 5

Explanation:

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we know the algebraic identity:

x²-y² = (x+y)(x-y)

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Given ,

x²-y² = 15 ----(1)

x+y = 3 ------(2)

Now ,

x² - y² = 15

=> (x+y)(x-y) = 15

=> 3 × (x-y) = 15 /*from (1)*/

=> x-y = 15/3

=> x - y = 5

Therefore,

x - y = 5

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