Rozwiąż równania: a) -7(x+2) +4 = -3x b) -4(1/2x - 2) -4 = 2(-x + 2) c) 2x(x - 1) +4 = 2(x - 1)^2 d) -(x - 2)^2 + 3(x - 7) = 2 -(x + 1)(x - 1)

a) -7(x+2) +4 = -3x -7x-14+4 = -3x -7x+3x =10 -4x = 10/:(-4) x= -2,5 b) -4(1/2x - 2) -4 = 2(-x + 2) -2x+8-4=-2x+4 -2x+2x=-4+4 0=0 c) 2x(x - 1) +4 = 2(x - 1)^2 2x²-2x+4=2(x²-2x+1) 2x²-2x+4=2x²-4x+2 2x²-2x-2x²+4x=2-4 2x=-2 /:2 x=-1 d) -(x - 2)^2 + 3(x - 7) = 2 -(x + 1)(x - 1) -(x²-4x+4)+3x-21=2-x²+1 -x²+4x-4+3x-21=2-x²+1 -x²+x²+7x=3+25 7x=28/:7 x=4