Respostas

  • Usuário do Brainly
2014-08-15T17:40:06-03:00
X² - 14x +49=0
a=1
b=-14
c=49

Δ=b²-4ac
Δ=14²-4.1.49
Δ=196-196
Δ=0
√Δ=√0=0

x= (-b ± √Δ)/2a

x'=x"= \frac{14}{2} =7

S={ 7 }


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