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Multiply the entire equation by x to eliminate the fraction.

Mathematics

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Answer

x=3+7,3−7x = 3 + \sqrt{7}, 3 - \sqrt{7}

Step-by-step solution

4 steps

To solve the equation x−6+2x=0x - 6 + \frac{2}{x} = 0, with the condition x≠0x \neq 0:

  1. Multiply the entire equation by xx to eliminate the fraction.

    Since x≠0x \neq 0, we can multiply both sides by xx without changing the validity of the equation.

    x⋅(x)−6⋅(x)+2x⋅(x)=0⋅(x)x \cdot (x) - 6 \cdot (x) + \frac{2}{x} \cdot (x) = 0 \cdot (x) x2−6x+2=0x^2 - 6x + 2 = 0
  2. Use the quadratic formula to solve for xx.

    The equation is in the standard quadratic form ax2+bx+c=0ax^2 + bx + c = 0, where a=1a=1, b=−6b=-6, and c=2c=2.
    The quadratic formula is x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}.

    Substitute the values of aa, bb, and cc into the formula:

    x=−(−6)±(−6)2−4(1)(2)2(1)x = \frac{-(-6) \pm \sqrt{(-6)^2 - 4(1)(2)}}{2(1)} x=6±36−82x = \frac{6 \pm \sqrt{36 - 8}}{2} x=6±282x = \frac{6 \pm \sqrt{28}}{2}
  3. Simplify the radical and the expression for xx.

    Simplify 28\sqrt{28}:

    28=4×7=4×7=27\sqrt{28} = \sqrt{4 \times 7} = \sqrt{4} \times \sqrt{7} = 2\sqrt{7}

    Substitute this back into the expression for xx:

    x=6±272x = \frac{6 \pm 2\sqrt{7}}{2}

    Factor out 2 from the numerator:

    x=2(3±7)2x = \frac{2(3 \pm \sqrt{7})}{2}

    Cancel out the common factor of 2:

    x=3±7x = 3 \pm \sqrt{7}
  4. Verify the solutions against the condition x≠0x \neq 0.

    The two solutions are x1=3+7x_1 = 3 + \sqrt{7} and x2=3−7x_2 = 3 - \sqrt{7}.
    Since 7\sqrt{7} is approximately 2.646, neither 3+73 + \sqrt{7} nor 3−73 - \sqrt{7} is equal to zero.
    Both solutions are valid.

    The final answers are x=3+7,3−7x = 3 + \sqrt{7}, 3 - \sqrt{7}.

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