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( 3 x + 4 y ) ^ { 2 } - ( 3 x - 4 y ) ^ { 2 } = 48 x y |
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Answer» (a+b)^2 =a^2 +b^2+2ab(a-b)^2=a^2 +b^2 -2abusing these identities (3x+4y)^2=9x^2 +16y^2 +24xy...... (1)(3x-4y)^2=9x^2 +16y^2 -24xy........ (2)subtracting 2 from 1(3x+4y)^2 - (3x-4y)^2 =(9x^2 +16y^2 +24xy)-(9x^2 +16y^2 -24xy)(3x+4y)^2 - (3x-4y)^2 =48xy ghatiya you can ask if you have not understood any point please give answer in simple language |
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