x
=
-
b
±
b
2
-
4
a
c
2
a
" class="Wirisformula" role="math" alt="x equals fraction numerator negative b plus-or-minus square root of b squared minus 4 a c end root over denominator 2 a end fraction" title="x equals fraction numerator negative b plus-or-minus square root of b squared minus 4 a c end root over denominator 2 a end fraction" style="vertical-align: -16px; height: 50px; width: 147px;">