exam Maths Puzzle Numerical Ability

Simplify the expression?

(square root of 3-5)(square root of 3 + 5)

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exam Other Question

Please help me with the following

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2^-3a^-3/c(2a^3c - 8a^3/c^2)

thank u can you please show me the steps to getting the correct answer on this type of a problem?