Answer:
x(x + 2) / x + 5
Explanation:
f(x) = x² - 1 / x + 4
f(x + 1) = (x + 1)² - 1 / x + 1 + 4
= x² + 1 + 2x - 1 / x + 5
= x² + 2x / x + 5
= x (x + 2) / x + 5
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