book Maths Puzzle Numerical Ability

If x = �1 and y = 2, what is the value of the expression 2x3 � 3xy ?

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book Other Question

what is the name of the solution of the quadratic equation x squared- x-1=0? Two trains leave Chicago, one traveling East at 30 miles per hour, and one traveling west at 40 miles per hour. When will the trains be 210 miles apart?
(We are supposed to be using the formula d=rt.)