exam Maths Puzzle Numerical Ability

I need help for this problem:
Show that √2 + √(5 - 2√6)= √3

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exam Other Question

The following augmented matrix represents the system of what equstions:

1/3/2/4
2/-1/5/-2
-3/1/6/1 Given: h is parallel to d
Prove: m<11+m<10+m<18=180

the three angles make a triangle.