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11. Scoateţi factorul comun:
a)
2√3x²(x-3)-12√3x(x-3)+18√3(x-3);
b) 4√7x² (x+1)+8√7x(x+1)+16√7(x+1);
c) 4√3x³(2x-1)-4√3x (2x-1)+√√3(2x-1);
d) 9√5x² (3x+2)+12√5x(3x+2)+4√5 (3x+2).