Question

Formula de baskara - 21+x^2+4x=0

Answer 1

a=1 b=4 c=21

∆=-b^2-4.a.c

∆=-4^2-4.1.-21

∆=16+84

∆=100

X=-4+/-√(100) X=-4+/-10

2.1

x1=-4+10=6/2=3

x2=-4-10=-14/2=-7

Answer 2

Resposta:

x' = 3

x" = -7

Explicação passo-a-passo:

x²+4x-21=0

x= -b+√b²-4ac

           2a

x= -4+√4²-4(1)(-21)

           2(1)

x= -4+√100

           2

x'= -4+10    = 3

       2

x"= -4 -10   = -7

       2