Question

Please anybody answer very very important​

Answer 1

Answer:

7. a+b a-b= a²-b²

√13²-√5²

13-5

8

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Answer 2

$\frac{(6 - 4 \sqrt{3}) }{(6 + 4 \sqrt{3} )} \times \frac{(6 - 4 \sqrt{3} )}{(6 - 4 \sqrt{3} )} \\ \frac{36 + 48 - 48 \sqrt{3} }{36 - 48} \\ \frac{84 - 48 \sqrt{3} }{ - 12 } \\ \frac{7 - 4 \sqrt{3} }{ - 1} \\ 4 \sqrt{3} - 7$

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