Question

2x^2+7x+3=0 ??? Formula de gradul al 2 lea.

Answer 1

Sau apluci formula sau descompui 2 x patrat+6x+x+3= 2x(x+3)+(x+3)=(x+3)(2x+1) => x1=-3 si x2=-1/2

Answer 2

$\displaystyle 2x^2+7x+3=0 \\\\ \Delta=7^2-4\cdot2\cdot3 \\ \Delta=49-24 \\ \Delta=25 \\ \\ \boxed{X_{1,2}=\frac{-b\pm \sqrt{\Delta} }{2a}} \\ \\ \\ X_1= \frac{-7-5}{4}=-3 \\ \\ X_2= \frac{-7+ 5 }{4}= -0.5$