Question

Graph of ( y=4 x^{3}-30 x^{2}+72 x-55 )
( y^{prime}=12 x^{2}-60 x+72=12left(x^{2}-5 x+6right)=0 )
wh ( y^{prime}=0 )
( 12(x-2)(x-3)=0 )
( x=2,3 )
( & y^{prime prime} Rightarrow 24 x-60=12(12 x-5) )
tie ( y^{prime prime}(x=2) ) ? ( -12<0 quad rightarrow max _{text {DECEMBER }} )
( y^{prime prime} x=3^{2} 12>0 rightarrow m^{prime prime} )

# D-1. Draw the graph of following function (i) y = 4x3 - 30x2 + 72x - 55

Solution