1.

If x+y=10 and xy = 2l find 2( x²+ y²]​

Answer»

Answer:

We have

=> x + y = 10

and

=> xy = 21

Then To Find = 2(x² + y²)

Proof : Using Given,

=> x + y = 10

Square both SIDES

=> (x + y)² = 100

=> x² + y² + 2XY = 100

=> x² + y² + 2(21) = 100 (given)

=> x² + y² = 58

Multiply by 2 on both sides

=> 2(x² + y²) = 116

Hence Found

Step-by-step EXPLANATION:


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