exam Maths Puzzle Numerical Ability

. Simplify the rational expression:
2x2 � 12x + 18
2x2 � 18

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exam Other Question

Solve

x-3/15 = 1/3 Suppose a scientet makes two measurements x1 and x2 of a quantity whose true measure x is not known. The errors are then x-x1 and x-x2. What number can be assigned to x so that the sum of the squares is a mininum?