2) Resolva as seguintes equações do 2º grau, sendo U = IR:
me ajudem por favor!!!
a) x² + x (x-6)=0
b) x ( x + 3 ) = 5x
c) x (x-3)-2 (x-3) = 6
d) (x + 5)² = 25
e) (x-2)²=4 - 9x
f) (x + 1)(x-3)=-3​
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