$\left(x+2\right)\left(x+3\right)$
$\left(2+\sqrt{y}\right)\left(2-\sqrt{y}\right)$
$\left(6x-5\right)\left(2x+3\right)$
$4\left(4a+5\right)$
$\left(5x+2y\right)\left(5x-2y\right)$
$\left(2x+6\right)^2$
$\left(x-6\right)\left(x-5\right)$
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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