book Maths Puzzle Numerical Ability

Can someone explain polynomials? like p(x)=(x-1)(x-2)(x-3)(x-4)

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book Other Question

Multiply (X2Y2)(X2Y)
A) 4X2Y B) XY2X2Y C) 2X2Y2Y D) X4Y3 the natural base e is also referred to as the ________ number.