Prove No.B by LHS and RHS

1.	Prove No.B by LHS and RHS
Answer» Answer: 3x - 7Y = 10 --- ( 1 ) XY = -1 ---( 2 ) Do the Square of EQUATION ( 1 ) , we get , ( 3x - 7y )² = 10² ( 3x )² + ( 7y )² - 2 × 3x × 7y = 100 9x² + 49y² - 42xy = 100 9x² + 49y² - 42 × ( -1 ) = 100 9x² + 49y² + 42 = 100 9x² + 49y² = 100 - 42 = 58 I hope this helps you. Read more on Brainly.in - brainly.in/question/3616488#readmore

Answer»

Answer:

3x - 7Y = 10 --- ( 1 )

XY = -1 ---( 2 )

Do the Square of EQUATION ( 1 ) , we

get ,

( 3x - 7y )² = 10²

( 3x )² + ( 7y )² - 2 × 3x × 7y = 100

9x² + 49y² - 42xy = 100

9x² + 49y² - 42 × ( -1 ) = 100

9x² + 49y² + 42 = 100

9x² + 49y² = 100 - 42

= 58

I hope this helps you.

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