Question

me ajudem pfv
qual o resultado
81x²-36=0?​

Answer 1

$\Large\mathsf\displaystyle{} {81x}^{2} - 36 = 0 \\ \\ \Large\mathsf\displaystyle{} {9x}^{2} - 4 = 0 \\ \\ \Large\mathsf\displaystyle{} {9x}^{2} = 4 \\ \\ \Large\mathsf\displaystyle{} {x}^{2} = \dfrac{4}{9} \\ \\ \\ \Large\mathsf\displaystyle{}x = \pm \sqrt{ \dfrac{4}{9} } \\ \\ \Large\mathsf\displaystyle{}x = \pm \: \dfrac{2}{3} \\ \\ \\ \Large\mathsf\displaystyle{}x = - \dfrac{2}{3} \\ \\ \Large\mathsf\displaystyle{}x = \dfrac{2}{3} \\ \\ \Large\displaystyle\text{ \begin{gathered} \underline{\boxed{\boldsymbol{ x_{1} = - \dfrac{2}{3} }}}\end{gathered} } \\ \Large\displaystyle\text{ \begin{gathered} \underline{\boxed{\boldsymbol{ x_{2} = \dfrac{2}{3} }}}\end{gathered} }$

$\displaystyle\text{ \begin{gathered} \underline{\boxed{\boldsymbol{{ \red{Bons}} \blue{\:Estudos}}}}\end{gathered} }$