Let be defined by

MATHEMATICS · Single correct · AoPS · Mathematics · Special Functions · Special Functions

Problem

Let f:R→Rf:\mathbb{R}\to\mathbb{R} be defined by f(x)=2x+∣x∣f(x)=2x+|x|. Then f(2x)+f(−x)−f(x)=f(2x)+f(-x)-f(x)= (a) 2x2x (b) 2∣x∣2|x| (c) −2x-2x (d) −2∣x∣-2|x|

Related theory

Browse the problem library