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$\left(-9\right)-\left(-4\right)$
$\left(-9\right)-\left(-6\right)$
$8-\left(-1\right)$
$-5-9$
$3-\left(-6\right)$
$-1+3$
$-7-3$
The quadratic equations (or second degree equations) are those equations where the greatest exponent to which the unknown is raised is the exponent 2.
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