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प्रश्न
Multiply: 2a2 − 5a − 4 and −3a
बेरीज
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उत्तर
−3a (2a2 − 5a − 4)
= −3a × 2a2 − 5a × −3a − 4 × −3a
= −6a3 + 15a2 + 12a
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