Resposta:
5)
[tex] \Large\boxed{ \green{figura \: da \: letra \: c)}}[/tex]
6)
[tex](2x - 1)(2x + 3) = 0 \\ \\ 2x - 1 = 0 \: \: ou \: 2x + 3 = 0 \\ \\ 2x - 1 = 0 \\ \\ 2x = 1 \\ \\ \boxed{x = \dfrac{1}{2} } \\ \\ ou \\ \\ 2x + 3 = 0 \\ \\ 2x = - 3 \\ \\ \boxed{ x = - \dfrac{3}{2} } \\ \\ \Large\boxed{ \green{ S = \left \{ - \dfrac{3 }{2} \: ou \: \dfrac{1}{2} \right\}}} \\ \\ \Large\boxed{ \underline{ \: \blue{\: \bf Bons \: Estudos!}}}[/tex]
