1)х²-64=0
(х-8)*(х+8)=0
а)х-8=0
х=8
б)х+8=0
х=-8
2)4x^2-25=0,раскладываем на множители:
(2х-5)(2х+5)=0
2х-5=0 или 2х+5=0
2х=5 2х=-5
х=2,5
3)9 х2+16=0
х2=-16/9
корней нет, т. к. из отрицательного числа корень нельзя извлечь
4) (2x-3)²-36=0
(2x-3)²=36
2x-3=± 6
2x-3=6 2x=6+3 2x=9 x=9/2
2x-3=-6 2x=-6+3 2x=-3 x=-3/2
ответ:x₁=-3/2
x₂=9/2
9: 43
<
Social Studies
5 points
Question from Egor9klass
Why civil
society in developed countries
formed only in
the last two centuries?
Answer
VERIFIED RESPONSE
Account deleted •
Civil
society is possible only under legal conditions
(democratic)
states. That's why it
formed in developed countries only in
the last two centuries, since before
this was the case in an authoritarian and totalitarian way
mode in which
civil society is functioning normally
can't.
4.0 (64)
COMMENT
estimate
thanks
III
5x+3y=-40|*3
-15x+20y=120
15x+9y=-120
29y=0
y=0
-3x+4y=24
y=0
-3x +4*0=24
y=0
-3x=24
y=0
x=-8
ответ: х=-8, у=0