1)
ответ:
2)
-x^2+2x+15=0
-1+-√1+15
x=----------------
-1
-1+-4
x=------------
x=5
x=-3
5 + 2x - x^2= - (x-5) (x+3)
x=5 x=-3
3)
1)
ответ:
2)
-x^2+2x+15=0
-1+-√1+15
x=----------------
-1
-1+-4
x=------------
-1
x=5
x=-3
5 + 2x - x^2= - (x-5) (x+3)
x=5 x=-3
ответ:![(-\infty; 3] \cup [5,+\infty)](/tpl/images/0162/8307/e731a.png)
3)
ответ:![[0,5; 2,4]](/tpl/images/0162/8307/e0288.png)