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

Two cars start together and travel on the same direction, one going twice as fast as the other. At the end of 3 hours, they are 96 miles apart. How fast is each car traveling? The area of a triangle is 250 in^2. Find the lengths of its legs if one leg is 5 inches longer than the other.

i know area is 1/2bh. let x=shorter leg and x+5=longer leg so i know area=1/2*x*x+5=250 i need to solve for x.