1)Use a fórmula de Bháskara para resolver as equações no conjunto dos números reais
a) y²+6y-7=0
b)y²+7x + 10=o
c)u²-14u +49=0
d)x²-3x +8=0
e)9x²-6x+1=0
f)12x²+5x-2=0

2)considere a equação 16x²-9x=0

a)resolva-a usando fatoração
b)resolva-a usando a fórmula de Bháskara

3)Considere a equação x²-6x+5=0

a) por fatoração
b)pela fórmula de Bháskara
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