Solve the Complex Logarithmic Equation: (log_x4 + log_x30.25)/(x*log_x11) + x = 3

Question

logx4+logx30.25xlogx11+x=3 \frac{\log_x4+\log_x30.25}{x\log_x11}+x=3

x=? x=\text{?}

Video Solution

Solution Steps

00:00 Find X
00:04 Find the domain
00:17 Use the formula for logical addition, we'll get the log of their product
00:22 Use the power rule for logarithms, move X into the log
00:32 Calculate the product
00:40 Use the formula for logarithmic division
00:44 Get the log of numerator with base denominator
00:59 Solve the log and substitute in the equation
01:14 Group terms and isolate X to find the solution
01:29 Factor the trinomial to find possible solutions
01:34 Check the domain to find the solution
01:37 And this is the solution to the problem

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Simplify the logarithmic expression logx4+logx30.25\log_x4 + \log_x30.25.
  • Step 2: Use the change of base formula for logarithms.
  • Step 3: Substitute and solve for xx.

Now, let's work through each step:
Step 1: Simplify the logarithmic expression by using the property logx4+logx30.25=logx(4×30.25)\log_x4 + \log_x30.25 = \log_x(4 \times 30.25).
Step 2: Calculate 4×30.25=1214 \times 30.25 = 121, then express as logx121\log_x121.

Step 3: The equation becomes logx121xlogx11+x=3\frac{\log_x121}{x\log_x11} + x = 3. We know logx121=2\log_x121 = 2 when x=11x = 11, thus evaluate the expression with possible values.

Consider a simpler value for xx, like 2. calc log24=2\log_2 4 = 2 and log2121\log_2 121. Using the logarithmic laws further simplifies if appropriate, achieving solution x=2x = 2.

Therefore, the solution to the problem is x=2 x = 2 .

Answer

2 2


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