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The trajectory of a particle moving in xy-plane is y=x3-3x2-4x+12. The particle crosses the x-axis :
a)Once
b) Twice
c) Three times
d) Four times
Dear abhingya
y=x3-3x2-4x+12
f(x)= x3-3x2-4x+12
f(-2) =0
f(2) =0
f(3) =0
clearly it cut the x axis at three points
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