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Mathematics for IGCSE & O level - Functions (Section 1 - No. 38)

If f(x) = x + 2, then f^-1(x) is:
x - 2
2 - x
1/(x+2)
-x - 2

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To find the inverse, swap x and y (where y = f(x)) and solve for y. So, y = x+2 becomes x = y+2, thus y = x-2.

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