Add, subtract and multiply the given expressions — task. Mathematics State Board, Class 9.

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Add, subtract multiply the expressions

(11 \sqrt{31} + 6 \sqrt{47})

and

(13 \sqrt{47} - 8 \sqrt{31})

1. Addition of expressions result in

i \sqrt{i}

i \sqrt{47}

2. Subtraction of expressions result in

i \sqrt{i}

i \sqrt{47}

3. Multiplication of expressions result in

i \sqrt{1457} + i

[Note: For the third question, insert your answer with a sign if it has a negative sign in it.]

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13. Add, subtract and multiply the given expressions