Q. Given the function f(x)=(6x2−3)(5−2x2+7x−1), find f′(x) in any form.Answer: f′(x)=
Apply Product Rule: To find the derivative of the function f(x)=(6x2−3)(5−2x2+7x−1), 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)=6x2−3 and the second function as v(x)=5−2x2+7x−1. We will find the derivatives u′(x) and v′(x) separately.
Find u′(x): The derivative of u(x)=6x2−3 with respect to x is u′(x)=dxd(6x2)−dxd(3)=12x−0=12x.
Find v′(x): The derivative of v(x)=5−2x2+7x−1 with respect to x is v′(x)=dxd(5)−dxd(2x2)+dxd(7x−1)=0−4x+(−7)x−2=−4x−7x−2.
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)=(12x)(5−2x2+7x−1)+(6x2−3)(−4x−7x−2).
Distribute Terms: We will now distribute the terms in the expression for f′(x): f′(x)=12x(5)−12x(2x2)+12x(7x−1)−(6x2)(4x)−(6x2)(7x−2)−3(−4x)−3(−7x−2).
Simplify Expression: Simplify the expression by performing the multiplications: f′(x)=60x−24x3+84x0−24x3−42x0−12x+21x−2.
Combine Like Terms: Combine like terms in the expression for f′(x): f′(x)=(60x−12x)−(24x3+24x3)+(84−42)+21x−2.
Final Answer: After combining like terms, we get f′(x)=48x−48x3+42+21x−2.
Final Answer: After combining like terms, we get f′(x)=48x−48x3+42+21x−2.We have found the derivative of the function f(x) in its simplified form. The final answer is f′(x)=48x−48x3+42+21x−2.
More problems from Find derivatives of using multiple formulae