3 years ago

Answer 8 and 9 for 10+ points

Mathematics

1 answer:

castortr0y [4]3 years ago

4 0

Answer:

question 8 : it is equal to 0

Question 9 : 4+5 $\sqrt{2}$

Step-by-step explanation:

= $\sqrt{7} -\sqrt{28}\\2\sqrt{7} - \sqrt{4x7}\\2\sqrt{7} - 2\sqrt{7}\\0\\\sqrt{2} (5+\sqrt{8})\\5\sqrt{2} + \sqrt{2*8}\\5\sqrt{2} + 4\\4 + 5\sqrt{2}$

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