SOLUTION: what positive number is equal to its square added to its opposite

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Question 699000: what positive number is equal to its square added to its opposite
Answer by MathLover1(20850) About Me  (Show Source):
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let number be x
given: number is equal to its square added to its opposite; so, we have
x=x%5E2%2B%28-x%29
x=x%5E2-x
0=x%5E2-x-x
0=x%5E2-2x
0=x%28x-2%29
solutions:
0=x or 0=x-2..=> 2=x

so, since zero is neither a negative nor a positive number, positive number 2 is only solution you can have
and it is equal to its square 2%5E2 added to its opposite -2
check:
2=2%5E2%2B%28-2%29
2=4-2
2=2