Q. Given the function f(x)=(2x3−7)(−4x3+10−3x), find f′(x) in any form.Answer: f′(x)=
Apply Product Rule: To find the derivative of the function f(x)=(2x3−7)(−4x3+10−3x), we will use the product rule. The product rule states that the derivative of a product of two functions is the derivative of the first function times the second function plus the first function times the derivative of the second function.
Define Functions: Let's denote the first function as u(x)=2x3−7 and the second function as v(x)=−4x3+10−3x. We will find the derivatives of u(x) and v(x) separately.
Find u′(x): The derivative of u(x)=2x3−7 with respect to x is u′(x)=dxd(2x3)−dxd(7). Using the power rule, we get u′(x)=3⋅2x3−1−0=6x2.
Find v′(x): The derivative of v(x)=−4x3+10−3x with respect to x is v′(x)=dxd(−4x3)+dxd(10)−dxd(3x). Using the power rule and the fact that the derivative of a constant is zero, we get v′(x)=−3⋅4x3−1−0−3=−12x2−3.
Apply Product Rule Again: Now we apply the product rule: f′(x)=u′(x)v(x)+u(x)v′(x). Substituting the derivatives we found, we get f′(x)=(6x2)(−4x3+10−3x)+(2x3−7)(−12x2−3).
Expand Terms: We will now expand the terms: f′(x)=(6x2)(−4x3)+(6x2)(10)−(6x2)(3x)+(2x3)(−12x2)−(2x3)(3)−(7)(−12x2)−(7)(−3).
Simplify Terms: Simplifying the terms, we get f′(x)=−24x5+60x2−18x3−24x5−6x3+84x2+21.
Combine Like Terms: Combining like terms, we get f′(x)=−48x5−24x3+144x2+21.
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