Question
If f(x)= \ array cc a|x|+x^ 2 -2( |x|)( |x|) x &, x 0 \\ b &, x=0 array . is continuous at x=0, then a+b is equal to
If f(x)= \ array cc a|x|+x^ 2 -2( |x|)( |x|) x &, x 0 \\ b &, x=0 array . is continuous at x=0, then a+b is equal to
C. 2
Note 2 |x| |x| = (2|x|). For x > 0: f(x) = a + x - 2x x x 0^+ a - 2. For x For continuity: a - 2 = 2 - a a = 2, and b = a - 2 = 0. a + b = 2.
Related: Mathematics — Continuity and Differentiability · All PYQ Banks