Answer :
Final answer:
The expression equivalent to (x-1)⁷ is x⁷ - 7x⁶ + 21x⁵ - 35x⁴ + 35x³ - 21x² + 7x - 1. option 4
Explanation:
To find the expression equivalent to (x-1)⁷, we can expand it using the binomial theorem. The binomial theorem states that for any positive integer n, the expansion of (a + b)ⁿ is given by (n choose 0)aⁿ b⁰ + (n choose 1)aⁿ⁻¹ b¹ + ... + (n choose n-1)abⁿ⁻¹ + (n choose n)a⁰ bⁿ.
Using this formula, we can expand (x-1)⁷ as follows:
(7 choose 0)x⁷(-1)⁰ + (7 choose 1)x⁶(-1)¹ + (7 choose 2)x⁵(-1)² + (7 choose 3)x⁴(-1)³ + (7 choose 4)x³(-1)⁴ + (7 choose 5)x²(-1)⁵ + (7 choose 6)x¹(-1)⁶ + (7 choose 7)x⁰(-1)⁷
Simplifying this expression, we get x⁷ - 7x⁶ + 21x⁵ - 35x⁴ + 35x³ - 21x² + 7x - 1.
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