9- A“menor”dasraízesdaequaçãox2 x120é:
a) 3
b) 4
c) –3
d) –4

10- Qualdeveserovalorde“m”naequação 2x2 mx400 paraqueasomadesuasraízesseja igual a 8?
a) 8 b) 16 c) –38 d) –20
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