book Maths Puzzle Numerical Ability

Simplify: a to the square root of 8 - 3 to the square root of 2a^2

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book Other Question

How do you find the variable in the equation below?

1095600 = x + (y + 0.04) If the sides of a square are decreased by 2 cm, the area is decreased by 36 cm^2. What were the dimensions of the original square?