First slide
Introduction to limits
Question

Iflimx11+ax+bx2cx-1=e3, then the value of bc is ______

Moderate
Solution

limx1 1+ax+bx2cx-1=e3orelimx11+ax+bx2-1cx-1=e3orelimx1cax+bx2x-1=e3orlimh0cax+bx2x-1=3orlimh0ca1+h+ba+h21+h-1=3orlimh0ca+b+ac+2bh+bh2h=3orca+b=0andac+2b=3orb=3andac=-3Also,theformmustbe1forwhicha+b=0,i.e.,a=-3andc=1.

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