<span>{ 5 - 3x >= -1 { 3 - 4x >= 8 => { 3x =< 6 { 4x =< -5 => { x =< 2 { x =< -5\4 => x=< -</span><span />
(х+1)^2=16 х + 1 = +-4 х₁ = 4 -1 = 3 х₂ = -4 - 1 = -5
(x-1)^2=0 х - 1 =0 х = 1
(x-5)^2=1 х -5 = +-1 х ₁= 1+5 = 6 х₂ = -1 + 5 = 4
(2x-1)^2=4 2х - 1 = +-2 2х₁ = 2+1 = 3 х₁ = 3/2
2х₂ = -2 + 1 = -1 х₂ = -1/2
<span>(3x+6)^2=100 3х + 6 = +-10 3х</span>₁ = 10 - 6 = 4 х₁ = 4/3
3х₂ = -10-6 = -16 х₂ = -16/3
(3-2x)^2=25 3 - 2х = +-5 2х₁ = 3 - 5 = -2 х₁ = -2/2 = -1
2х₂ = 3 + 5 = 8 х₂ = 8/2 = 4
-x^2-3x+4=0; D=(-3)^2-4*(-1)*4=9+16=25; x1=(3-5)/(-2), x2=(3+5)/(-2). x1=1, x2= -4. -x^2-3x+4= -1*(x-1)*(x+4)=(1-x)*(x+4).
30a-5(a^2+6a+9)=30a-5a^2-30a-45=-5a^2+45.
-5 *3+45=30