$\left(2+\sqrt{y}\right)\left(2-\sqrt{y}\right)$
$\left(5x+2y\right)\left(5x-2y\right)$
$\left(x-6\right)\left(x-5\right)$
$\left(2x+5\right)\cdot\left(2x-5\right)$
$\left(x^2-3\right)\left(-3-x^2\right)$
$\left(x+3\right)\left(x-1\right)$
$\left(x+2\right)\left(x+1\right)$
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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