Răspunsuri

2013-12-30T13:20:43+02:00
(x+1)*(x+2)= x^{2} +3x+2
 x^{2} +3x+2-72=0 (ecuatie de gradul II)
a=1,b=3,c=-70
Δ=delta
Δ= b^{2} -4ac
  =9-(-280)
  =289 (ecuatia are doua solutii reale)
x1= \frac{-b+\sqrt{delta}}{2a}
x1=7
x2= \frac{-b-\sqrt{delta}}{2a}
x2=-10

1 1 1