Question

rezolvati in R ecuatia X la a2 -3x-10=0

Answer 1

[tex] x^2 -3x-10=0\\ \triangle=b^2-4ac=(-3)^2-4\cdot 1 \cdot (-10)=9+40=49\\ x_{1/2}= \frac{-b\pm\sqrt{\triangle}}{2a} = \frac{3\pm7}{2} \\ x_1= \frac{3+7}{2} =5\\ x_2= \frac{3-7}{2} =-2[/tex]