( Х + 10 )^2 = ( 2 - Х )^2
Х^2 + 20х + 100 = 4 - 4х + х^2
20х + 4х = 4 - 100
24х = - 96
Х = - 96 : 24
Х = - 4
Ответ ( - 4 )
1)(x-2)/(x-3)=(x+2)/(x+3)
(x-2)*(x+3)=(x-3)*(x+2)
x^2+3x-2x-6=x^2+2x-3x-6
x^2+x-6-x^2+x+6=0
2x=0
x=0
0,573(573/1000) ; 0,574(574/1000) ; 0,576(576/1000) 0,578(578/1000)
/ - знак дроби
3b^2+2b+2b^2-13b-4-(2b+19)
3b^2+2b+2b^2-13b-4-2b-19
5b^2-13b-23
A)
x = - (x- 5)
x = x - 5
x = - x + 5 ==> 2x = 5 ==> x = 2,5
x = x - 5 ==> 0x=-5
б)
x = x + 14
x = - x - 14
0x = 14 ==> нет реш
2x = - 14 ==> x = - 7
в)
x - 2 = x - 8
x - 2 = - x + 8
0x = - 6 ==> нет реш
2x = 10 ==> x = 5
г)
x + 3 = x - 7
x + 3 = - x + 7
0x = - 10 ==> нет реш
2x = 4 ==> x = 2