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प्रश्न
If f(x) = 3x2 − 5x + 7 find f(x − 1).
बेरीज
उत्तर
f(x) = 3x2 – 5x + 7
∴ f(x – 1) = 3(x – 1)2 – 5(x – 1) + 7
= 3(x2 – 2x + 1) – 5(x – 1) + 7
= 3x2 – 6x + 3 – 5x + 5 + 7
= 3x2 – 11x + 15
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