g¹(x)=(x³-6x²-63x)¹=3x²-12x-63
3x²-12x-63≤0
3(x²-4x-21)≤0
x²-4x-21≤0 + + + + - - - - - - + + ++ + +
D=16+84=100 , x₁=(4-10)/2=-3 , x₂=7 (-3)(7)
x∈[-3 ,7]
g¹(x)=(x³-6x²-63x)¹=3x²-12x-63
3x²-12x-63≤0
3(x²-4x-21)≤0
x²-4x-21≤0 + + + + - - - - - - + + ++ + +
D=16+84=100 , x₁=(4-10)/2=-3 , x₂=7 (-3)(7)
x∈[-3 ,7]