Tính a) 2x3+5x2+4x-12 b) (x2+x)2+4x2+4x-12 c) x(x+1)(x+2)(x+3)+1

c1)2x3+5x2+4x-12

c2)(x2+x)2+4x2+4x-12

c3)x(x+1)(x+2)(x+3)+1

help me!!!!!