exam Maths Puzzle Numerical Ability

The square of a number decreased by 2 is equal to the negative of the number. Find the number.

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please help me solve this problem.

graph and check to solve the linear system.

-x+y=3
x+y=5 I have the following equation:

X = -((1 + Y)/W) + 1

I am trying to isolate and solve this for W.

Thanks