book Maths Puzzle Numerical Ability

What is the answer to:

X squared = -X

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book Other Question

How do you rewrite the following linear equations in standard form. And can you show the work...

1. y=x-9

2. y=x+6

3. y=1/2x-4

4. y= -0.5+5x

Thank you so much.
find the fourth propotional of the following
l^2-m^2,(l+m)^2,(l-m)(l^2-lm+m^2)