Question

3x²-2x sobre 5x-1, para x= 3/4 calcular a expressao

Answer 1

$<span> \dfrac{3x^2 - 2x}{5x - 1} </span>$

Substitui o valor 3/4 em x

$\dfrac{3 (\dfrac{3}{4})^2 - 2(\dfrac{3}{4})}{5(\dfrac{3}{4}) - 1} \\ \\ \\ \dfrac{3 (\dfrac{9}{16}) - (\dfrac{6}{4})}{\dfrac{15}{4} - 1} \\ \\ \\ \dfrac{\dfrac{3}{16} - \dfrac{3}{2}}{\dfrac{15 - 4}{4}} \\ \\ \\ \dfrac{\dfrac{3}{16}}{\dfrac{11}{4}} \\ \\ \\ \dfrac{3}{16} * \dfrac{4}{11} \\ \\ \\ \dfrac{12}{176} \\ \\ \\ => \dfrac{3}{44}$