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Given the function 
f(x)=(-10-2x^(2)+5x^(-1))(-8-x^(2)), find 
f^(')(x) in any form.
Answer: 
f^(')(x)=

Given the function f(x)=(102x2+5x1)(8x2) f(x)=\left(-10-2 x^{2}+5 x^{-1}\right)\left(-8-x^{2}\right) , find f(x) f^{\prime}(x) in any form.\newlineAnswer: f(x)= f^{\prime}(x)=

Full solution

Q. Given the function f(x)=(102x2+5x1)(8x2) f(x)=\left(-10-2 x^{2}+5 x^{-1}\right)\left(-8-x^{2}\right) , find f(x) f^{\prime}(x) in any form.\newlineAnswer: f(x)= f^{\prime}(x)=
  1. Apply Product Rule: To find the derivative of the function f(x)=(102x2+5x1)(8x2)f(x) = (-10 - 2x^2 + 5x^{-1})(-8 - x^2), 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)=102x2+5x1u(x) = -10 - 2x^2 + 5x^{-1} and the second function as v(x)=8x2v(x) = -8 - x^2. We will first find the derivative of u(x)u(x), which is u(x)u'(x).
  3. Find u(x)u'(x): The derivative of u(x)=102x2+5x1u(x) = -10 - 2x^2 + 5x^{-1} is found by differentiating each term separately. The derivative of a constant is 00, the derivative of 2x2-2x^2 is 4x-4x, and the derivative of 5x15x^{-1} is 5x2-5x^{-2} (using the power rule).\newlineSo, u(x)=04x5x2u'(x) = 0 - 4x - 5x^{-2}.
  4. Find v(x)v'(x): Now we will find the derivative of v(x)=8x2v(x) = -8 - x^2. The derivative of a constant is 00, and the derivative of x2-x^2 is 2x-2x. So, v(x)=02x=2xv'(x) = 0 - 2x = -2x.
  5. Use Product Rule: Using the product rule, the derivative of f(x)f(x) is 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)=(4x5x2)(8x2)+(102x2+5x1)(2x)f'(x) = (-4x - 5x^{-2})(-8 - x^2) + (-10 - 2x^2 + 5x^{-1})(-2x).
  6. Expand Expressions: Now we will expand the expressions to simplify them. For the first part, we distribute (4x5x2)(-4x - 5x^{-2}) across (8x2)(-8 - x^2), and for the second part, we distribute (102x2+5x1)(-10 - 2x^2 + 5x^{-1}) across (2x)(-2x).
  7. Expand First Part: Expanding the first part, we get:\newline(4x)(8)+(4x)(x2)+(5x2)(8)+(5x2)(x2)(-4x)(-8) + (-4x)(-x^2) + (-5x^{-2})(-8) + (-5x^{-2})(-x^2)\newline=32x+4x3+40x2+5x2+2= 32x + 4x^3 + 40x^{-2} + 5x^{-2 + 2}\newline=32x+4x3+40x2+5= 32x + 4x^3 + 40x^{-2} + 5
  8. Expand Second Part: Expanding the second part, we get:\newline(10)(2x)+(2x2)(2x)+(5x1)(2x)(-10)(-2x) + (-2x^2)(-2x) + (5x^{-1})(-2x)\newline=20x4x310= 20x - 4x^3 - 10
  9. Combine Like Terms: Now we combine like terms from both expanded parts to get the final derivative:\newlinef(x)=(32x+4x3+40x2+5)+(20x4x310)f'(x) = (32x + 4x^3 + 40x^{-2} + 5) + (20x - 4x^3 - 10)\newline=32x+4x3+40x2+5+20x4x310= 32x + 4x^3 + 40x^{-2} + 5 + 20x - 4x^3 - 10\newline=52x+40x25= 52x + 40x^{-2} - 5
  10. Final Derivative: We have found the derivative of the function f(x)f(x), which is:\newlinef(x)=52x+40x25f'(x) = 52x + 40x^{-2} - 5\newlineThis is the final answer.

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