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प्रश्न
Subtract: -x2 + 10x - 5 from 5x - 10
उत्तर
(5x - 10) - (-x2 + 10x - 5) = 5x - 10 + x2 - 10x + 5
= x2 + 5x - 10x - 10 + 5
= x2 - 5x - 5
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