1)(2а+3b)(4а^2-6ab+9b^2)=(2a+3b)(2a-3b)^2
2)-4x^2+8x-4=-(2x-2)^2
3)(2x+3)^2=(2x-5)(2x+5)-2
4x^2+12x+9=4x^2-25-2
4x^2-4x^2+12x+9+25+2=0
12x+36=0
12x=-36
x=-3
1)(2а+3b)(4а^2-6ab+9b^2)=(2a+3b)(2a-3b)^2
2)-4x^2+8x-4=-(2x-2)^2
3)(2x+3)^2=(2x-5)(2x+5)-2
4x^2+12x+9=4x^2-25-2
4x^2-4x^2+12x+9+25+2=0
12x+36=0
12x=-36
x=-3