exam Maths Puzzle Numerical Ability

please help me figure out this problem. I think I know the answer but I cant figure out how to get there. [3x-2y]^2. I can only come up with 9x^2+4y^2. please help.

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exam Other Question

This question needs to be solved with the addition/elimination method.
0.4x-0.1y=0.3
-80x+20y=40 Can someone please help me with this problem?
The last line of synthetic division for (2x^4-5x^3+7x^2-3x+1)/(x-3) gives coefficients for the quotient of 2,1,8,21.
Is this true or false?
I thought the answer was false. Am I right please help!!!