exam Maths Puzzle Numerical Ability

Subtract then simplify

(2 square root 18) - (4 square root 2)

Any help please?

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exam Other Question

A photo is 3 inches longer that it is wide. A 2-inch border is placed around the photo making the total area of the photo and border 108in^2. What are the dimensions of the photo. Solve: x^2 - 4x - 1=0 by completing the square.