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Given the function 
f(x)=(7-8x-10x^(3))(-6x^(2)-5), find 
f^(')(x) in any form.
Answer: 
f^(')(x)=

Given the function f(x)=(78x10x3)(6x25) f(x)=\left(7-8 x-10 x^{3}\right)\left(-6 x^{2}-5\right) , find f(x) f^{\prime}(x) in any form.\newlineAnswer: f(x)= f^{\prime}(x)=

Full solution

Q. Given the function f(x)=(78x10x3)(6x25) f(x)=\left(7-8 x-10 x^{3}\right)\left(-6 x^{2}-5\right) , find f(x) f^{\prime}(x) in any form.\newlineAnswer: f(x)= f^{\prime}(x)=
  1. Product Rule Explanation: To find the derivative of the function f(x)=(78x10x3)(6x25)f(x)=(7-8x-10x^{3})(-6x^{2}-5), 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.
  2. Define Functions: Let's denote the first function as u(x)=78x10x3u(x) = 7 - 8x - 10x^3 and the second function as v(x)=6x25v(x) = -6x^2 - 5. We will find the derivatives of u(x)u(x) and v(x)v(x) separately.
  3. Derivative of u(x)u(x): The derivative of u(x)=78x10x3u(x) = 7 - 8x - 10x^3 with respect to xx is u(x)=0830x2u'(x) = 0 - 8 - 30x^2. Simplifying, we get u(x)=830x2u'(x) = -8 - 30x^2.
  4. Derivative of v(x)v(x): The derivative of v(x)=6x25v(x) = -6x^2 - 5 with respect to xx is v(x)=12x0v'(x) = -12x - 0. Simplifying, we get v(x)=12xv'(x) = -12x.
  5. Apply Product Rule: Now, we apply the product rule: f(x)=u(x)v(x)+u(x)v(x)f'(x) = u'(x)v(x) + u(x)v'(x). Substituting the derivatives we found, we get f(x)=(830x2)(6x25)+(78x10x3)(12x)f'(x) = (-8 - 30x^2)(-6x^2 - 5) + (7 - 8x - 10x^3)(-12x).
  6. Distribute Terms: We will now distribute the terms in the expression f(x)=(830x2)(6x25)+(78x10x3)(12x)f'(x) = (-8 - 30x^2)(-6x^2 - 5) + (7 - 8x - 10x^3)(-12x). This involves multiplying each term in the first product and adding it to the result of multiplying each term in the second product.
  7. First Product Simplification: Multiplying the terms in the first product, we get: (8)(6x2)+(8)(5)+(30x2)(6x2)+(30x2)(5)(-8)(-6x^2) + (-8)(-5) + (-30x^2)(-6x^2) + (-30x^2)(-5). This simplifies to 48x2+40180x4+150x248x^2 + 40 - 180x^4 + 150x^2.
  8. Second Product Simplification: Multiplying the terms in the second product, we get: (7)(12x)+(8x)(12x)+(10x3)(12x)(7)(-12x) + (-8x)(-12x) + (-10x^3)(-12x). This simplifies to 84x+96x2+120x4-84x + 96x^2 + 120x^4.
  9. Combine Results: Adding the results from the two products, we get f(x)=(48x2+40180x4+150x2)+(84x+96x2+120x4)f'(x) = (48x^2 + 40 - 180x^4 + 150x^2) + (-84x + 96x^2 + 120x^4).
  10. Correct v(x)v'(x): Combining like terms, we get f(x)=180x4+120x4+48x2+150x2+96x2+4084xf'(x) = -180x^4 + 120x^4 + 48x^2 + 150x^2 + 96x^2 + 40 - 84x. This simplifies to f(x)=60x4+294x284x+40f'(x) = -60x^4 + 294x^2 - 84x + 40.
  11. Reapply Product Rule: Correcting the derivative of v(x)v(x), we have v(x)=12xv'(x) = -12x. Now we will reapply the product rule with the correct derivatives: f(x)=u(x)v(x)+u(x)v(x)=(830x2)(6x25)+(78x10x3)(12x)f'(x) = u'(x)v(x) + u(x)v'(x) = (-8 - 30x^2)(-6x^2 - 5) + (7 - 8x - 10x^3)(-12x).
  12. First Product with Correct Derivative: Multiplying the terms in the first product with the correct derivative, we get: (8)(6x2)+(8)(5)+(30x2)(6x2)+(30x2)(5)(-8)(-6x^2) + (-8)(-5) + (-30x^2)(-6x^2) + (-30x^2)(-5). This simplifies to 48x2+40+180x4150x248x^2 + 40 + 180x^4 - 150x^2.
  13. Second Product with Correct Derivative: Multiplying the terms in the second product with the correct derivative, we get: (7)(12x)+(8x)(12x)+(10x3)(12x)(7)(-12x) + (-8x)(-12x) + (-10x^3)(-12x). This simplifies to 84x+96x2+120x4-84x + 96x^2 + 120x^4.
  14. Combine Results with Correct Derivatives: Adding the results from the two products with the correct derivatives, we get f(x)=(48x2+40+180x4150x2)+(84x+96x2+120x4)f'(x) = (48x^2 + 40 + 180x^4 - 150x^2) + (-84x + 96x^2 + 120x^4).
  15. Combine Results with Correct Derivatives: Adding the results from the two products with the correct derivatives, we get f(x)=(48x2+40+180x4150x2)+(84x+96x2+120x4)f'(x) = (48x^2 + 40 + 180x^4 - 150x^2) + (-84x + 96x^2 + 120x^4). Combining like terms with the correct derivatives, we get f(x)=180x4+120x4+48x2150x2+96x2+4084xf'(x) = 180x^4 + 120x^4 + 48x^2 - 150x^2 + 96x^2 + 40 - 84x. This simplifies to f(x)=300x46x284x+40f'(x) = 300x^4 - 6x^2 - 84x + 40.

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