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प्रश्न
Evalute : `((2x)/7 - (7y)/4)^2`
बेरीज
उत्तर
`((2x)/7 - (7y)/4)^2`
We know that
( a - b )2 = a2 - 2ab + b2
∴ `((2x)/7 - (7y)/4)^2 = ((2x)/7)^2 + ((7y)/4)^2 - 2 xx (2x)/7 xx (7y)/4`
= `(4x^2)/(49) + (49y^2)/16 - xy`
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