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Solve the logarithmic equation: 2 2 x - 2 2 (8 − 3x) = 1

Mathematics

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Answer

x=48−8217x = \frac{48 - 8\sqrt{2}}{17}

Step-by-step solution

5 steps
  1. Divide the entire equation by 2.

    2log⁡2x−2log⁡2(8−3x)2=12\frac{2 \log_2 x - 2 \log_2 (8 - 3x)}{2} = \frac{1}{2} log⁡2x−log⁡2(8−3x)=12\log_2 x - \log_2 (8 - 3x) = \frac{1}{2}
  2. Apply the quotient rule of logarithms, log⁡bM−log⁡bN=log⁡b(MN)\log_b M - \log_b N = \log_b \left(\frac{M}{N}\right).

    log⁡2(x8−3x)=12\log_2 \left(\frac{x}{8 - 3x}\right) = \frac{1}{2}
  3. Convert the logarithmic equation to an exponential equation.

    If log⁡bM=c\log_b M = c, then bc=Mb^c = M.

    x8−3x=212\frac{x}{8 - 3x} = 2^{\frac{1}{2}} x8−3x=2\frac{x}{8 - 3x} = \sqrt{2}
  4. Solve for xx.

    Multiply both sides by (8−3x)(8 - 3x).

    x=2(8−3x)x = \sqrt{2}(8 - 3x) x=82−32xx = 8\sqrt{2} - 3\sqrt{2}x

    Move all terms containing xx to one side.

    x+32x=82x + 3\sqrt{2}x = 8\sqrt{2}

    Factor out xx.

    x(1+32)=82x(1 + 3\sqrt{2}) = 8\sqrt{2}

    Divide to isolate xx.

    x=821+32x = \frac{8\sqrt{2}}{1 + 3\sqrt{2}}

    Rationalize the denominator by multiplying the numerator and denominator by the conjugate of the denominator, which is 1−321 - 3\sqrt{2}.

    x=821+32×1−321−32x = \frac{8\sqrt{2}}{1 + 3\sqrt{2}} \times \frac{1 - 3\sqrt{2}}{1 - 3\sqrt{2}} x=82(1−32)12−(32)2x = \frac{8\sqrt{2}(1 - 3\sqrt{2})}{1^2 - (3\sqrt{2})^2} x=82−82⋅321−(9⋅2)x = \frac{8\sqrt{2} - 8\sqrt{2} \cdot 3\sqrt{2}}{1 - (9 \cdot 2)} x=82−24⋅21−18x = \frac{8\sqrt{2} - 24 \cdot 2}{1 - 18} x=82−48−17x = \frac{8\sqrt{2} - 48}{-17} x=48−8217x = \frac{48 - 8\sqrt{2}}{17}
  5. Check for valid solutions.

    The arguments of the logarithms must be positive.

    1. x>0x > 0
    2. 8−3x>0  ⟹  8>3x  ⟹  x<838 - 3x > 0 \implies 8 > 3x \implies x < \frac{8}{3}

    Let's approximate the value of xx:
    x≈48−8×1.41417≈48−11.31217≈36.68817≈2.158x \approx \frac{48 - 8 \times 1.414}{17} \approx \frac{48 - 11.312}{17} \approx \frac{36.688}{17} \approx 2.158
    This value satisfies both conditions (2.158>02.158 > 0 and 2.158<83≈2.6672.158 < \frac{8}{3} \approx 2.667).

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