(3-2х)(6х-1)=(2х-3)²
18x-3-12x²+2х=4х²-12x+9
18x-3-12x²+2х-4х²+12x-9=0
-16x²+32х-12=0
16х²-32x+12=0
4x²-8х+3х=0
D/4=16-12=4
√D/4=2
x₁=4+2/4=1,5
х₂=4-2/2=1
87 - 41 - y = 22
- y = - 46 + 22
- y = - 24
y = 24
Проверка:
87 - ( 41 + 24) = 22
87 - 65 = 22
22 = 22 - верно.