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Factorise (x+1)³+(x-1)³ plz attach the file also for better understanding.. it's urgent please.... |
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Answer» to factorize (x+1)³ - (x-1)³we can use the FOLLOWING identitya³ - b³ = (a - B)(a² + ab + b²)here, a = x+1 and b = x - 1therefore (x+1)³ - (x+1)³=> (x+1)-(x-1) [ (x+1)² + (x+1)(x-1) + (x-1)² ]=> x+1-x+1 [ x²+1+2x+x²-1+x²+1-2x ]=> 2(3x² + 1) |
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