exam Maths Puzzle Numerical Ability

Multiply and then simplify the product. All variables represent positive real numbers.

(√18+√8)(√18-√8)

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exam Other Question

this is a problem i would like to ask that if i know the circumference of an oval
which is 1000m, how to find the area of this oval. please help me with this question. thanks. Are the following lines parallel, perpendicular, or neither?
L1 with equation x - 4y = 12
L2 with equation 4x + y = 4