Q. Given the function f(x)=3−4x3x, find f′(x) in simplified form.Answer: f′(x)=
Identify Function: Identify the function that needs to be differentiated.The function given is f(x)=3−4x3x. We need to find its derivative, which is denoted by f′(x).
Apply Quotient Rule: Apply the quotient rule for differentiation.The quotient rule states that if we have a function that is the quotient of two functions, v(x)u(x), then its derivative is given by (v(x))2v(x)u′(x)−u(x)v′(x). Here, u(x)=x and v(x)=3−4x3.
Differentiate u(x): Differentiate u(x) with respect to x. The derivative of u(x)=x with respect to x is u′(x)=1.
Differentiate v(x): Differentiate v(x) with respect to x. The derivative of v(x)=3−4x3 with respect to x is v′(x)=−12x2.
Substitute into Formula: Substitute u(x), u′(x), v(x), and v′(x) into the quotient rule formula.Using the quotient rule, we get f′(x)=(3−4x3)2(3−4x3)(1)−(x)(−12x2).
Simplify Expression: Simplify the expression.Simplify the numerator: (3−4x3)(1)−(x)(−12x2)=3−4x3+12x3.Combine like terms: 3+8x3.Now, f′(x)=(3−4x3)23+8x3.
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