Q. Given the function f(x)=5−4x4x, find f′(x) in simplified form.Answer: f′(x)=
Identify u(x) and v(x): We need to find the derivative of the function f(x)=5−4x4x. This is a quotient, so we will use the quotient rule for differentiation, which states that if we have a function g(x)=v(x)u(x), then g′(x)=(v(x))2u′(x)v(x)−u(x)v′(x).
Compute derivatives u′(x) and v′(x): First, identify u(x) and v(x). Here, u(x)=x and v(x)=5−4x4. Then compute the derivatives u′(x) and v′(x). The derivative of u(x) with respect to x is v′(x)0. The derivative of v(x) with respect to x is v′(x)3.
Apply quotient rule: Now apply the quotient rule. f′(x)=(v(x))2u′(x)v(x)−u(x)v′(x)=(5−4x4)2(1⋅(5−4x4)−x⋅(−16x3)).
Simplify numerator: Simplify the numerator of the derivative. f′(x)=(5−4x4)25−4x4+16x4=(5−4x4)25+12x4.
Final derivative: The derivative f′(x) is now in simplified form. f′(x)=(5−4x4)25+12x4.
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