Уравнение к виду ax^2+bx+c=0 1)x(3x+5)-1=x(x-4) 2)(6+x)^2=(x-2)(3-x) 3)(7x-1)(2+x)=(x-4)(x+4) 3)x(8-3x)=(5x-1)^2

1)x(3x+5)-1=x(x-4)
3x^2+5x-1=x^2-4x
2x^2+9x-1=0
2)(6+x)^2=(x-2)(3-x)
36+12x+x^2 = 3x-x^2-6+2x
2x^2+7x+42=0
3)(7x-1)(2+x)=(x-4)(x+4)
14x+7x^2-2-x = x^2+4x-4x-16
6x^2+13x+14=0
3)x(8-3x)=(5x-1)^2
8x-3x^2=25x^2-10x+1
28x^2-18x+1=0