First slide
Continuity
Question

Let fx=x2-1,0x<112,1x2andgx=2x+1x-k+3,x0. Then g(f(x)) is continuous at x = 1 if 12k rs equal to ______

Moderate
Solution

gfx=gx2-1,0x<1g12,1x2=x-1x-2-2k2+3,0x<14-2k,1x<2limx1-gfx=3,gf1=4-2kandlimx1+gfx=4-2kforgfxotbecontinuousatx=1,4-2k=3ork=12.

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