Question

x^2+5x <0
x>-7
решите систему неравенства

Answer 1

х^2-5x-7=0
D = 25 - 4 * 2 * (-7) = 25 + 56 =  81; √D = 9
x1 = (5 - 9) / 4 = -1
x2 =  (5 + 9) / 4 = 3,5 
Ответ: -1 ; 3,5