exam Maths Puzzle Numerical Ability

The following augmented matrix represents the system of what equstions:

1/3/2/4
2/-1/5/-2
-3/1/6/1

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exam Other Question

Divide and Simplify:

5x - 7
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25x² - 49
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5x² + 27x + 28</PRE>
I need help for this problem:
Show that √2 + √(5 - 2√6)= √3