你如何使用产品规则区分g(x)=(x ^ 2 + 1)(x ^ 2-3x)?

你如何使用产品规则区分g(x)=(x ^ 2 + 1)(x ^ 2-3x)?
Anonim

回答:

#G'(X)= 4×^ 3-6x ^ 2 + 2X-2#

说明:

#G(X)=(X ^ 2 + 1)(X ^ 2-2x)#

产品规则:#d / DX(UV)=(DU)/ DXV + U(DV)/ DX#

#U =(X ^ 2 + 1)#

#DU / DX = 2×#

#V = X ^ 2-2x#

#的dv / DX = 2×= 2#

#d / DX(X ^ 2 + 1)(X ^ 2-2x)=(DU)/ DXV + U(DU)/ DX#

=#2×(X ^ 2-2x)+(X ^ 2 + 1)(2X-2)#

=#2×^ 3-4倍^ 2 + 2×^ 3-2x ^ 2 + 2X-2#

=#4倍^ 3-6x ^ 2 + 2X-2#