1) 0=x+2 +4x-7
x=1
2) 0=2x^3 - 3x^2 +1
x1= -1/2, x2=1
x1= - 0,5, x2=1
3) y-9 = -x^2+6x-9 -5
y-9 = - (x^2-6x+9) -5
y-9 = - (x-3)^2-5
y= - (x+3)^2 -5 +9
y= -(x-3)^2+4
4) 0=x^3 +3x^2 - 9x
x1 =
, x2 = 0, x3 = 
x1 = - 4,8541, x2=0, x3= 1,8541
5) 0 = x^4-2x^2-3
x1 = -
, x2= 
x1= -1,73205, x2= 1,73205
6) y=0^3 + 4 * 0-8
y=-8
7) y=0^4-8*0-9
y=9
8) y=9+4*0^3-0^4
y=9
9) y+100=x^2-20x+100
y+100=(x-10)^2
y= (x-10)^2-100
10) 0=cos(x)
x=π/2 + kπ, k ∈ Z
Пошаговое объяснение: