Q. Given the function f(x)=1−2x4x, find f′(x) in simplified form.Answer: f′(x)=
Quotient Rule Explanation: To find the derivative of the function f(x)=1−2x4x, 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 (v(x))2v(x)u′(x)−u(x)v′(x). Here, u(x)=x and v(x)=1−2x4.
Find u′(x): First, we need to find the derivative of u(x), which is u′(x). Since u(x)=x, the derivative u′(x) is 1 because the derivative of x with respect to x is 1.
Find v′(x): Next, we need to find the derivative of v(x), which is v′(x). Since v(x)=1−2x4, we apply the power rule to find the derivative of −2x4. The power rule states that the derivative of xn with respect to x is n⋅xn−1. Therefore, v′(x)=0−2⋅4⋅x4−1=−8x3.
Apply Quotient Rule: Now we apply the quotient rule. We have u′(x)=1 and v′(x)=−8x3, so we plug these into the quotient rule formula:f′(x)=(1−2x4)2(1−2x4)(1)−(x)(−8x3)
Simplify Derivative: Simplify the numerator of the derivative:f′(x)=(1−2x4)21−2x4−(−8x4)f′(x)=(1−2x4)21−2x4+8x4f′(x)=(1−2x4)21+6x4
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