5х^2 - 11х = y
5x - 11 = y
Решение
5х^2 - 11х = 5х - 11
5х^2 - 16х + 11 = 0
D = 256 - 220 = 36 ; V D = 6
X1 = ( 16 + 6 ) : 10 = 2,2
X2 = ( 16 - 6 ) : 10 = 1
y = 5x - 11
y1 = 11 - 11 = 0
y2 = 5 - 11 = - 6
Ответ ( 2,2 ; 0 ) ; ( 1 ; - 6 )
5 + 2х = 8 (х - 2)
5 + 2х = 8х - 16
2х - 8х = - 16 - 5
- 6х = - 21
х = - 21/6 = - 3 3/6 = - 3,5
Ответ: - 3,5
5а² - 20а + 20 = 5·(а² - 4а + 4 )? = 5·(а - 2)²