exam Maths Puzzle Numerical Ability

ex.wk6

Problem #5
Simplify:

2radical (12) + 4 radocal (27)

Problem #6

Simplify:

radical (7) TImes radical (14)

Problem #7

Simplify:
(7 + radical (5)) (7-rad

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exam Other Question

Combine: (2√7+√2)(3√7-4√2) How do I solve?
Thanks for your help.
sqrt 12a^2b=