exam Maths Puzzle Numerical Ability

Is the following trinomial a perfect square?
x2 – 4x + 4

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exam Other Question

8x to the square root of 4 y to the square root of 2 divided by 3z to the square root of 3 times 9xy to the square root of 2 z to the square root of 6 divided by 4y to the square r How do I express this as a simplified rational number 10/3-5/2