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प्रश्न
Use the direct method to evaluate the following products :
(y + 5)(y – 3)
बेरीज
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उत्तर
(y + 5) (y – 3) = (y × y) + (y × −3) + (5 × y) + (5 × −3)
= y2 + (−3y) + (5y) − 15
= y2 − 3y + 5y − 15
= y2 + 2y − 15
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