book Maths Puzzle Numerical Ability

For the following piecewise defined function find f(0)

f(x)={x^2+1,.....x<0
{x-1,.......x>0

Help, please...

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book Other Question

Two gears rotate so that one completes one more revolution per minute than the other. If it takes the smaller gear one second less than the larger gear to complete one-fifth revolu How do i solve this equation?

3(4c+7)=12c