Q. Given the function f(x)=5−2x4x, find f′(x) in simplified form.Answer: f′(x)=
Apply Quotient Rule: To find the derivative of the function f(x)=5−2x4x, we will use the quotient rule. The quotient rule states that if we have a function that is the quotient of two functions, v(x)u(x), then its derivative f′(x) is given by:f′(x)=(v(x))2v(x)⋅u′(x)−u(x)⋅v′(x)Here, u(x)=x and v(x)=5−2x4.
Find u′(x): First, we find the derivative of u(x) with respect to x. Since u(x)=x, the derivative u′(x) is:u′(x)=dxd(x)=1
Find v′(x): Next, we find the derivative of v(x) with respect to x. Since v(x)=5−2x4, the derivative v′(x) is:v′(x)=dxd(5−2x4)=0−2⋅4x3=−8x3
Apply Quotient Rule: Now we apply the quotient rule using the derivatives u′(x) and v′(x) we found: f′(x)=(5−2x4)2(5−2x4)⋅(1)−(x)⋅(−8x3)
Simplify Numerator: Simplify the numerator of the derivative:f′(x)=(5−2x4)25−2x4−(−8x4)f′(x)=(5−2x4)25+6x4
Final Derivative: The derivative f′(x) is now in simplified form:f′(x)=25−20x4+4x85+6x4
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