Solve the equation x+1+5−x=0x + 1 + \sqrt{5 - x} = 0.

  1. (2)
    1. (b)

      Solve the equation log⁡x(2x−1)=log⁡x2(4−5x)\log_x(2x-1) = \log_{x^2}(4-5x).

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Worked solution

1(2)(b)

1. Change the base of the logarithm on the right-hand side to $x$.

log⁡x(2x−1)=log⁡x(4−5x)log⁡x(x2)\log_x(2x-1) = \frac{\log_x(4-5x)}{\log_x(x^2)}
log⁡x(2x−1)=log⁡x(4−5x)2\log_x(2x-1) = \frac{\log_x(4-5x)}{2}

2. Use the power law of logarithms to combine the terms.

2log⁡x(2x−1)=log⁡x(4−5x)2\log_x(2x-1) = \log_x(4-5x)
log⁡x(2x−1)2=log⁡x(4−5x)\log_x(2x-1)^2 = \log_x(4-5x)

3. Equate the arguments and form a quadratic equation.

(2x−1)2=4−5x(2x-1)^2 = 4-5x
4x2−4x+1=4−5x4x^2 - 4x + 1 = 4 - 5x
4x2+x−3=04x^2 + x - 3 = 0

4. Solve the quadratic equation and reject any invalid solutions.

(4x−3)(x+1)=0(4x - 3)(x + 1) = 0
x=34 or x=−1x = \frac{3}{4} \text{ or } x = -1

For logarithms to be defined, the base x>0x > 0 and x≠1x \neq 1, and the arguments 2x−1>02x-1 > 0 and 4−5x>04-5x > 0.
When x=−1x = -1, the base is negative, so x=−1x = -1 is rejected.
When x=34x = \frac{3}{4}, 2(34)−1=0.5>02(\frac{3}{4})-1 = 0.5 > 0 and 4−5(34)=0.25>04-5(\frac{3}{4}) = 0.25 > 0, so it is valid.

x=34x = \frac{3}{4}

Answer

x=34x = \frac{3}{4}

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