Apply the quotient rule, which is:
dxdg(x)f(x)=g2(x)−f(x)dxdg(x)+g(x)dxdf(x)
f(x)=x4 and g(x)=2.
To find dxdf(x):
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Apply the power rule: x4 goes to 4x3
To find dxdg(x):
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The derivative of the constant 2 is zero.
Now plug in to the quotient rule:
2x3