exam Maths Puzzle Numerical Ability

how do i simplify the following; 2x^6 -6x^4 +4x^3 / 2x^5

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exam Other Question

If 12 is subtracted from three times a number and the difference is multiplied by 2, the result is -42. Find the number. (i) When x = 5, the integer x� -1=24 has 8 divisors: 1, 2, 3, 4, 6, 8, 12, and 24
Determine for which odd positive integer x between 2 and 20, the number x� -1 had the largest num