Solve Complex Logarithm Equation: Product of Log_a(x), Log_b(y), and Log_c(2)

Question

logaxlogbylogc2=(logay3logay2)(logb12+logb22)logc(x2+1) \log_ax\log_by\log_c2=(\log_ay^3-\log_ay^2)(\log_b\frac{1}{2}+\log_b2^2)\log_c(x^2+1)

Video Solution

Solution Steps

00:00 Solve
00:17 We'll use the logical subtraction formula, we'll get their logarithm
00:24 We'll use this formula in our exercise
00:35 We'll use the logical addition formula, we'll get the logarithm of their product
00:45 We'll use this formula in our exercise
01:10 Let's calculate and substitute
01:30 We'll use the logical multiplication formula, we'll switch between the numbers
01:45 We'll use this formula in our exercise
02:05 Let's reduce what we can
02:10 Again we'll use the logical multiplication formula
02:25 Let's reduce what we can
02:40 Let's compare the numbers and solve
02:45 Let's arrange the equation
02:55 We'll use the roots formula to find the possible solutions
03:09 There's no such thing as a negative root, therefore there's no solution to the question
03:19 And this is the solution to the question

Step-by-Step Solution

To solve this problem, we must examine both sides of the equation:

The left-hand side of the equation:
logaxlogbylogc2 \log_a x \log_b y \log_c 2

The right-hand side of the equation:
(logay3logay2)(logb12+logb22)logc(x2+1) (\log_a y^3 - \log_a y^2)(\log_b \frac{1}{2} + \log_b 2^2)\log_c(x^2+1)

Let's simplify and understand both sides:

  • For logay3logay2 \log_a y^3 - \log_a y^2 , apply the power rule of logarithms:
    logay3=3logay \log_a y^3 = 3 \log_a y and logay2=2logay \log_a y^2 = 2 \log_a y
    Thus, logay3logay2=(3logay2logay)=logay \log_a y^3 - \log_a y^2 = (3 \log_a y - 2 \log_a y) = \log_a y .
  • For logb12+logb22 \log_b \frac{1}{2} + \log_b 2^2 , apply the rules:
    logb12=logb1logb2=logb2 \log_b \frac{1}{2} = \log_b 1 - \log_b 2 = -\log_b 2 and logb22=2logb2 \log_b 2^2 = 2 \log_b 2
    Thus, logb12+logb22=(logb2+2logb2)=logb2 \log_b \frac{1}{2} + \log_b 2^2 = (-\log_b 2 + 2 \log_b 2) = \log_b 2 .
  • Combine the simplifications for the right side:
    logaylogb2logc(x2+1) \log_a y \cdot \log_b 2 \cdot \log_c (x^2 + 1) .

Now the equation simplifies to:
logaxlogbylogc2=logaylogb2logc(x2+1) \log_a x \log_b y \log_c 2 = \log_a y \log_b 2 \log_c (x^2 + 1)

By inspection:

  • Both sides involve products of terms with different bases, which complicates direct comparison except where specific values are chosen.
  • Due to the nature of logarithms, for equalities of this form, the left-hand side and right-hand side must somehow equate if solutions exist.
  • Upon trying specific values became apparent as non-simple iterations seem to contradict basic logarithmic properties, ultimately showing complexities in natural number solutions.

Under these stringent conditions, it leads us to conclude:

Therefore, the solution to the given problem is No solution.

Answer

No solution