Răspunsuri

2014-04-27T14:47:40+03:00
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
1 5 1