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Find the derivative of the following function.

y=log_(4)(7x^(3)-5x^(2))
Answer: 
y^(')=

Find the derivative of the following function.\newliney=log4(7x35x2) y=\log _{4}\left(7 x^{3}-5 x^{2}\right) \newlineAnswer: y= y^{\prime}=

Full solution

Q. Find the derivative of the following function.\newliney=log4(7x35x2) y=\log _{4}\left(7 x^{3}-5 x^{2}\right) \newlineAnswer: y= y^{\prime}=
  1. Apply Chain Rule and Logarithmic Differentiation: To find the derivative of the function y=log4(7x35x2)y = \log_4(7x^3 - 5x^2), we will use the chain rule and the logarithmic differentiation rule. The chain rule states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function. The logarithmic differentiation rule for a logarithm with base aa is given by (d/dx)loga(u)=(1/u)(du/dx)(1/log(a))(d/dx) \log_a(u) = (1/u) \cdot (du/dx) \cdot (1/\log(a)), where uu is a function of xx.
  2. Express Logarithm with Base 44 in Natural Logarithm: First, we need to express the logarithm with base 44 in terms of the natural logarithm using the change of base formula: loga(u)=ln(u)ln(a)\log_a(u) = \frac{\ln(u)}{\ln(a)}. So, y=log4(7x35x2)y = \log_4(7x^3 - 5x^2) can be rewritten as y=ln(7x35x2)ln(4)y = \frac{\ln(7x^3 - 5x^2)}{\ln(4)}.
  3. Differentiate Quotient Using Quotient Rule: Now, we will differentiate yy with respect to xx using the quotient rule since yy is a quotient of two functions: ln(7x35x2)\ln(7x^3 - 5x^2) and ln(4)\ln(4). The quotient rule is given by (d/dx)[v(x)/u(x)]=(u(x)(dv/dx)v(x)(du/dx))/(u(x))2(d/dx) [v(x)/u(x)] = (u(x) * (dv/dx) - v(x) * (du/dx)) / (u(x))^2. However, since ln(4)\ln(4) is a constant, its derivative is 00, and the quotient rule simplifies to just the derivative of the numerator divided by the denominator.
  4. Apply Chain Rule to Differentiate Numerator: We differentiate the numerator ln(7x35x2)\ln(7x^3 - 5x^2) using the chain rule. The derivative of ln(u)\ln(u) with respect to uu is 1/u1/u, so we have (d/dx)ln(7x35x2)=1/(7x35x2)d/dx(7x35x2)(d/dx) \ln(7x^3 - 5x^2) = 1/(7x^3 - 5x^2) \cdot d/dx(7x^3 - 5x^2).
  5. Find Derivative of Inner Function: Next, we find the derivative of the inner function 7x35x27x^3 - 5x^2 with respect to xx. Using the power rule, which states that the derivative of xnx^n with respect to xx is nx(n1)n*x^{(n-1)}, we get ddx(7x35x2)=21x210x\frac{d}{dx}(7x^3 - 5x^2) = 21x^2 - 10x.
  6. Combine Results to Find Derivative of y: Now we can combine the results from the previous steps to find the derivative of y. We have y=17x35x221x210xln(4)y' = \frac{1}{7x^3 - 5x^2} \cdot \frac{21x^2 - 10x}{\ln(4)}.
  7. Simplify Expression for yy': Finally, we simplify the expression for yy' by multiplying the terms. This gives us y=21x210x(7x35x2)ln(4)y' = \frac{21x^2 - 10x}{(7x^3 - 5x^2) \cdot \ln(4)}.

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