plzzz answer step by step and right answer? ?
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( 3x - 7y ) = 10
( 3x - 7y )^2 = (10)^2
9x^2 + 49 y^2 - 2 × 3x × 7y = 100
9x^2 + 49y^2 - 42 xy = 100
9x ^2 + 49 y ^2 - 42× (-1) = 100
9x^2 + 49 y^2 = 100 - 42
9x^2 + 49y^2 = 58 ans.
( 3x - 7y )^2 = (10)^2
9x^2 + 49 y^2 - 2 × 3x × 7y = 100
9x^2 + 49y^2 - 42 xy = 100
9x ^2 + 49 y ^2 - 42× (-1) = 100
9x^2 + 49 y^2 = 100 - 42
9x^2 + 49y^2 = 58 ans.
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