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Mathematics for IGCSE & O level - Functions (Section 1 - No. 41)
If f(x) = x + 5, what is f^-1(x)?
x - 5
x + 5
-x + 5
-x - 5
Forklaring
Swap x and y, y = x+5 becomes x = y+5, so y = x-5
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