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Solving a Quadratic Equation

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When I work the problem square root of 4x^2 + 15 - 2x = 0, by using the quadratic equation, my answer is a real number because I end up with the square root of 256 which is 16.

Should I square both sides 1st or how do I solve the equation?

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A quadratic equation is solved. The square root numbers are determined.

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When I work the problem square root of 4x + 15 -2x = 0, by ...

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