Question

x2-8x+12=0
x2-4x-5=0
-x2+x+12+0 me ajudem nessas questoes de 2 grau ????pfv eh pra hj

Answer 1

$b^{2} -4ac$
$(-8^{2})$-4*1*12
64-48
16
x=(8+-4)/2
x'=12/2=6
x"=4/2=2