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6(x²-3x-4)=0
x²+x-4x-4=0
x(x+1)-4(x+1)=0
(x+1)(x-4)=0
f'(x)>0 dla x∈(-∞,-1)u(4,+∞)
f'(x)<0 dla x⇒(-1,4)
min=f(4)=2*64-9*16-24*4+60=-52
max=f(0)=60