exam Maths Puzzle Numerical Ability

Given A =
3 -2 0
1 4 2
-1 5 -3
find -3A.
Thank you for your help

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exam Other Question

if (1+i)(1+sqr(3)i)/1-i=2(cos x+i sin x) find the value of x? Can you show me how to simplify or solve for "x" in the following equations?

3(x+2)=-2(x+4)

2(x+1)=4-3(2x+1)

2(x+1)-3(x+7)=2

-3.6x+3.1=3(5.2-1.2x)

I would appreciate the help! Thank You =)