Question

Resposta do delta -x²+10x-21=0
A=b²-4.a.c
X= -b ± √a
2.a

Answer 1

Delta=10^-4*(-1)*(-21)
Delta=100-84
delta=16
X= -10+-\/delta/2*(-1)
X= -10+-4/-2
X'= -10+4/-2 = -3
X"= -10-4/-2= -7