4x2 + 4x +4= x+3
4x2 + 4x - x + 4-3 = 0
4x2 +3 x + 1 = 0
D=9-4*4*1=9-8=1
x=(-3+-1)/2*4
x1= (-3+1)/8 = -2/8 = - 1/4 = -0,25
x2 = (-3-1) /8 = -4 / 8 = - 1/2
= -0.5
(x-3)(2x+10)=(2+x)2
2x в квадрате +10x -6x -30 = 4-4x+ x2
2 x2 - x2 +8x -34 = 0
x2 + 8x-34 =0
D = 64-4*(-34)
D<0 Корней нет<br>