book Maths Puzzle Numerical Ability

i^-3

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fing the roots of the equestion:x^2+4x+8?
1.fing the roots by using compliting the squar method?
2.fing the roots by using factorisation method?
3.fing the roots by usin graphic Hi there-

I have this problem with an answer, but i can't figure out the equation to get the answer, or the mathematical way to find the answer (I use guess and check). If you c