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Official 2016 Paper 1 · Q18

Paper 1Functions & graphs

The function 1−xx23\dfrac{1-x}{\sqrt[3]{x^2}} is defined for all x≠0x\ne0.

The complete set of values of xx for which the function is decreasing is

Ax≤−2,x>0x\le-2,\quad x>0
B−2≤x<0-2\le x<0
Cx≤1,x≠0x\le1,\quad x\ne0
Dx≥1x\ge1
E−2≤x≤1,x≠0-2\le x\le1,\quad x\ne0
Fx≤−2,x≥1x\le-2,\quad x\ge1

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