1.(x,y)=(10,5) 2.(x,y)=( -1, -2) 3.(x,y)=( -5,0) 4.(x,y)=(5,1)
Объяснение:
1.
1.2(3+2y)+y=-4 1.-5+y-3y=-5 1.
2.3x-4*5=10 2.y=-2 2.y=0 2.3(7-2y)-4y=11
3.x=10 3.x=3+2(-2) 3.x=-5+0 3.y=1
4.x=-1 4.x=-5 4.x=7-2*1
5.x=5
a(x - x₁)(x - x₂) = ax² + bx + c
(x - (-1-√2))(x - (-1+√2)) =
(x + 1 + √2)(x + 1 - √2) =
(x + 1)² - √2² =
x² + 2x + 1 - 2 =
x² + 2x - 1