Question

Xét dấu y' biết y=2x^3-3x^2+1

 

Answer 1

y' = 6x² - 6x

y' = 0

6x² - 6x = 0

6x(x - 1) = 0

6x = 0 hoặc x - 1 = 0

*) 6x = 0

x = 0

*) x - 1 = 0

x = 1

Bảng xét dấu

x       - vô cùng   0    1      + vô cùng

6x² - 6x        +    0   -  0   +

Answer 2

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