book Maths Puzzle Numerical Ability

x^2+x+1=0
Can u please solve it and show me how to check it? thank you very much.

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book Other Question

Graph the following inequality and shade it.
3X - 4Y < 12 ( , ) ( , )Please describe the plotting in words.
x-1+x-2=1-2x
x+3+x-3=3-x this is a fraction,line goes acrossn all 3