Question

resolva a equação (2x-1)elevado a 2 =9

Answer 1

$(2x-1) ^{2}=9$
$(2x-1)(2x-1)=4x^{2}-4x+1=9$
$4 x^{2} -4x-8=0$
$x^{2} -x-2=0$
$x= \frac{1+/- \sqrt{1-4.1.(-2)} }{2}$
$x= \frac{1+/-3}{2}$
$x'= \frac{4}{2}=2$
$x"= \frac{-2}{2} =-1$