exam Maths Puzzle Numerical Ability

can you please show me the steps on soloving this problem and its solution thank you!

x^2+24x+63=

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exam Other Question

Hi,

My brother is 13, and just want to query this question.

9y - 3y = 6y.

Is this correct? or does it subtract the y aswell meaning the answer would be:

9y - 3y = 6.

Thanks!!
-2(3y-)=56
Help!!!