exam Maths Puzzle Numerical Ability

(3+4 radical sign 6)(-5-2 radical sign 6) Please help me simplify.
I came up with -63-26 radical sign 6
Can someone tell me if this is correct or where I went wrong?

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exam Other Question

I am very confussed on a problem, I barel even know where to start.
A/BH = 1/2 I am solving for H. I am very confussed, I know the LCD must be 2BH. I am just wondering how I am going about this. Show that the points D(-1,-2),E(2,1) and F(-3,6) are the vertices of a right triangle.