exam Maths Puzzle Numerical Ability

Subtract.

4x - 2x to the 2nd power + 4x to the 3rd power FROM 4x to the 3rd power + x - 3x squared

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exam Other Question

How many different four digit numbers can be formed from the digits 0 through 9 if the first digit must be even and cannot be zero? Can you help me find two pairs of relatively prime numbers from 5, 10, 16, and 25?