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<?xml version="1.0"?>
<!DOCTYPE mrow SYSTEM "mathml.dtd" [
<!ENTITY PlusMinus "plus minus">
<!ENTITY InvisibleTimes "*">
]>
<!-- The formula for the solutions of a quadratic equation
x = (-b +/- Sqrt(b^2 - 4ac))/2a
-->
<mrow>
<mi>x</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mrow>
<mo>-</mo>
<mi>b</mi>
</mrow>
<mo>±</mo>
<msqrt>
<mrow>
<msup>
<mi>b</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<mrow>
<mn>4</mn>
<mo>⁢</mo>
<mi>a</mi>
<mo>⁢</mo>
<mi>c</mi>
</mrow>
</mrow>
</msqrt>
</mrow>
<mrow>
<mn>2</mn>
<mo>⁢</mo>
<mi>a</mi>
</mrow>
</mfrac>
</mrow>
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