$7x^2+21x-28=0$
$4x^2+4x+1=0$
$6x-27=-x^2$
$x^2+\left(7-x\right)^2=25$
$4x^2+12x-16=0$
$x^2-18x+81=0$
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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