Respostas

  • Usuário do Brainly
2014-07-20T18:42:24-03:00
3 x^{2} =63-12x

3 x^{2} +12x-63=0  (:3)

 x^{2} +4x-21=0

Δ=b²-4ac
Δ=16+84
Δ=100
√Δ=10

x= \frac{-4+10}{2}= \frac{6}{2}  =3

R=Pedro tem 3 filhos


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