factorise x³-23x²+142x-120
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x²-23x²+142x-120
=(x² + 142 x ) -120 [(a+b)²formula]
=(x²+142x+120)(x²+142x-120)[(a-b) formula]
=(x² + 142 x ) -120 [(a+b)²formula]
=(x²+142x+120)(x²+142x-120)[(a-b) formula]
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