Question

$x^{2} - \frac{1}{2}x = \frac{15}{2} . Rezolvare in R$

Answer 1

Inmultim ecuatia cu 2 si trecem toti termenii in membrul stang.

$2x^2-x-15=0\Rightarrow \Delta=b^2-4ac=121; \ x_{1;2}=\dfrac{1\pm11}{4}$

$x_1=3;\ \ x_2=-\dfrac52$