Q. Given the function f(x)=(−5−4x−9x2)(6x3+10), find f′(x) in any form.Answer: f′(x)=
Apply Product Rule: To find the derivative of the function f(x)=(−5−4x−9x2)(6x3+10), 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)=−5−4x−9x2 and the second function as v(x)=6x3+10. We will find the derivatives of u(x) and v(x) separately.
Find u′(x): The derivative of u(x)=−5−4x−9x2 with respect to x is u′(x)=dxd(−5)−dxd(4x)−dxd(9x2)=0−4−18x.
Find v′(x): The derivative of v(x)=6x3+10 with respect to x is v′(x)=dxd(6x3)+dxd(10)=18x2+0.
Use Product Rule Formula: Now we apply the product rule: f′(x)=u′(x)v(x)+u(x)v′(x).
Substitute Derivatives: Substitute the derivatives and original functions into the product rule formula: f′(x)=(0−4−18x)(6x3+10)+(−5−4x−9x2)(18x2).
Simplify Expression: Simplify the expression by distributing and combining like terms: f′(x)=(−4)(6x3)+(−4)(10)+(−18x)(6x3)+(−18x)(10)−5(18x2)−4x(18x2)−9x2(18x2).
Combine Like Terms: Continue simplifying: f′(x)=−24x3−40−108x4−180x−90x2−72x3−162x4.
Final Result: Combine like terms: f′(x)=−108x4−162x4−24x3−72x3−90x2−180x−40.
Final Result: Combine like terms: f′(x)=−108x4−162x4−24x3−72x3−90x2−180x−40.Finish combining like terms: f′(x)=−270x4−96x3−90x2−180x−40.
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