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Solve the following exponential equations: 274x = 9^x+1 and ((1)/(8))⁻²x = 2^x+3.

Mathematics

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Answer

x=15x = \frac{1}{5}

Step-by-step solution

2 steps
  1. Solve 274x=9x+127^{4x} = 9^{x+1}.

    We express both sides with the same base, 3.

    (33)4x=(32)x+1(3^3)^{4x} = (3^2)^{x+1} 312x=32(x+1)3^{12x} = 3^{2(x+1)}

    Equate the exponents:

    12x=2x+212x = 2x + 2 10x=210x = 2 x=210x = \frac{2}{10} x=15x = \frac{1}{5}

    The solution is x=15\boxed{x = \frac{1}{5}}.

  2. Solve (18)−2x=2x+3(\frac{1}{8})^{-2x} = 2^{x+3}.

    We express both sides with the same base, 2.

    (2−3)−2x=2x+3(2^{-3})^{-2x} = 2^{x+3} 26x=2x+32^{6x} = 2^{x+3}

    Equate the exponents:

    6x=x+36x = x + 3 5x=35x = 3
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