Factorise 125 x³+8y³+z³-30xyz
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Posted by Edward Padhaku 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
(5x)³+(2y)³+(z)³-30xyz
=(5x+2y+z)[(5x)²+(2y)²+(z)²-(5x×2y)-
=(2y×z)-(5x×z)]
= (5x+2y+z)(25x²+4y²+z² -10xy - 2yz- 5xz)
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