exam Maths Puzzle Numerical Ability

(sqrt 6+ 2)^2
i got--- 14 sqrt6 is this right?

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I want to Thank you for your help. May I please have you show me how to do this problem - I am so confused and have tried to figure this out. Thank you again! What am I doing wrong how do you find the are of a right triangle with a=(-2,7), b=(7,-1), c=(3,9)