Question

If x+y=3 and x2 + y = 15 then value of (x - y)2 will be 1.21 2. 36 3.25 4. 16 please explain​

Answer 1

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Answer 2

Answer:=>(x+y)² =x²+y²+2xy =>3² = 15+2xy =>2xy = 9-15 = -6 =>xy = -3 =>(x-y)²= (x+y)²-4xy =>(x-y)²= 3²-4×-3 =>(x-y)²=9+12 =>(x-y)²=21.

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