exam Maths Puzzle Numerical Ability

x-[3x-2(9-x)-x}

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exam Other Question

The sum of the squares of two consecutive positive integers is 685. Find the integers. Solve by completeing square

x^2=4-7x

3x^2-x-x-2=0

If the square of 2 less than an interger is 16, find the number(s)?