Aqui, encontre o valor dos coeficientes das equações do 2° grau a seguir.

a) -x+8x²+3=0
b) x-x²=0
c) -x²=13
d) 3x-8=x²-9x
e) 3x+x.(2-x)=9
f) -x=8-x.(x+5)
g) 4-8x-1= -x²-8x+3
h) 5-9x-4x.(3x-2)=12​
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