Question

Qual o valor de x para que a função g(x)=$\frac{2}{5}x - \frac{6}{7}$ seja nula?

Answer 1

Para ser nula... g(x) deve ser igual a zero.

$g(x)= \frac{2}{5}x- \frac{6}{7} \\\\\\g(x)=0\\\\ \frac{2}{5}x- \frac{6}{7} =0\\\\ \frac{2}{5}x= \frac{6}{7} \\\\x= \frac{ \frac{6}{7} }{ \frac{2}{5} } \\\\x= \frac{6}{7}* \frac{5}{2}\\\\x= \frac{30}{14} ~~:(2)\\\\\boxed{x= \frac{15}{7} }$