Question

resolva as equasoes 2(3xx-5)=14

Answer 1

Resposta: x = +2 e -2.

Explicação passo-a-passo:

$\mathtt{2(3xx-5)=14}\\\\ \mathtt{2(3x^2-5)=14}\\\\ \mathtt{6x^2-10=14}\\\\ \mathtt{6x^2=14+10}\\\\ \mathtt{6x^2=24}\\\\ \mathtt{x^2=\dfrac{24}{6}}\\\\ \mathtt{x^2=4}\\\\ \mathtt{x=\sqrt4=\pm2}$