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प्रश्न
Factorise by the grouping method : y2 - (a + b) y + ab
योग
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उत्तर
y2 - (a + b) y + ab
= y2 - ay - by + ab
= y( y - a ) - b( y - a )
= ( y - a )( y - b )
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Factorisation by Grouping
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