exam Maths Puzzle Numerical Ability

Express in simplest form with rationalized denominators: a sqrt 2x^3 + sqrt 8a^2x^3

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exam Other Question

Use Property 2 to simplify the following radical expression.
√10/49
The radical symbol is over 10/49 multiply n^2-n-20/2n^2 multiplied by n^2+5n/n^2-25

My answer is n-4/2n Am I right? Please help, Thanks