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प्रश्न
Use the direct method to evaluate the following products :
(b – 3) (b – 5)
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उत्तर
(b – 3) (b – 5) = (b × b) + (b × −5) + (−3) × b + (−3) (−5)
= b2 − 5b − 3b + 15
= b2 − 8b + 15
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