Решение:
m=7
x2-14x+7=(x-<span>√7)2
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1) My parnts know so much because they have already travelled a lot.
2) We haven't seen George since last year.
3) I haven't seen this film yet.
4)Alice has just met her friend.
6) The kids have just played in the yard
5) I have never spoken to our teacher.
7) We haven't decided to help him yet.
8) I haven't seen my family for a long time.
9) Have you ever ridden the scooter.
10) Sara has never been snorkelling. She is so inactive!
Y=x²-4x-7=(x-2)²-11
(2;-11)- точка минимума
y(-1)=1+4-7=-2
y(2)=-11
y(5)=25-20-7=-2
y∈[-11;-2]
Хотя проще найти m=-b/2a=-1
n = (подставить m в функцию) = -2
получилась парабола с центром в точке (-1;-2)