Reaolva as equaçoes a)(x-4)^2=5X+16
b)x^2-9x=0
c)21x^2+7x=0
d)6x^2-x=0
e)5x(x-1)+(x+4)^2=16+6x

^2 esse simbolo significa elevado ao quadrado ta

please me ajudem
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