how to do, I don't know the step

answer is
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there are several methods to "solve a quadratic"

you can look them all up...

Graphing, factoring, completing the square, taking roots, quadratic formula are the common methods....

given the way you are asking the question I think that you are supposed to use the quadratic formula ..

please look at the image of the formula and

realize that you problem has

a=-1

b=2

c=6

just plug in those numbers into the formula and you will get the results in the "answer"

NOTE is written as ix ( )

Step-by-step explanation:

x=-2+√(2)²- (4)(-1)(-6)  

                 (2)(-1)  

and

x=-2-√(2)²- (4)(-1)(-6)  

             (2)(-1)  

answer: h

step-by-step explanation: