exam Maths Puzzle Numerical Ability

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3x^2+2y^2-6x+12y=0

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exam Other Question

Place any 16 positive integers(using no integer more than once) into a 4x4 square so that the sum of the 4 numbers of each row or column equals 44. 39
Prove the property
a11 a12 a13 b11 a12 a13 (a11 + b11) a12 a13
a21 a22 a23 + b21 a22 a23 = (a21 + b21) a22 a23
a31 a32 a33 b31 a32 a33 (a32 + b31) a32 a33
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