1. a=√(3-2√3)²
a=|3-2√3|
a=2√3-3
b=√12
b=2√3
a<b
2. x³+3x²-4x-12=
=x²(x+3)-4(x+3)=
=(x+3)(x²-4)=(x+3)(x+2)(x-2)
