1) Resolva a equação 2° grau completa
a) -3x²-2x+1=0
b) 4x² - 2x +0=0
c) x² - 4x +4=0
d) 3x² - 2x + 4 = 0
e) 2x² - 7x+3=0
formula: ∆=b²-4.a.c
x= -b ± √∆
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2.a​
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