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प्रश्न
Evalute : `( 7/8x + 4/5y)^2`
उत्तर
`( 7/8x + 4/5y)^2`
We know that
( a + b )2 = a2 + 2ab + b2
∴ `( 7/8x + 4/5y)^2`
= `(7/8x)^2 + (4/5y)^2 + 2 xx 7/8x xx 4/5y`
= `(49x^2)/(64) + (16y^2)/25 + (7xy)/5`
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