Question

x ao quadrado menos x mais 4 igual a 16

Answer 1

X2-x+4=16
X2-x-12=0------- a=1 b=-1 c=-12

Delta : b2-4ac
( -1)2 - 4.1.(-12)
1+48
-49

X: -b+-raiz quadrada de delta/2a
-1+-7/2
X1: -8/2 : -4
X2 6/2 : 3