REFERÊNCIAS:

https://www.google.com.br/imghp?hl=pt-BR&tab=ri&ogbl
https://www.pinterest.nz/pin/428053139564425801/?nic_v1=1agR5CQnvZr0rIubfujnXZtK0fubamKJVRUMAwesrm1THjR10avEEv1r%2Bt4QKkmoKS
https://br.pinterest.com/pin/545217098631413564/?nic_v1=1aZuTeZait3G0Kk1e3iFotQ6BBpSi2sd%2FqlFPtoSKyCOXvgSCxDZWF1y41bJ%2FrYBig
http://hotsite.tvescola.org.br/percursos/matematica/algebra-e-funcoes/equacao-do-2o-grau/