I know the formula but I this problem seems to be wrong when I solve it.

m^2+5m-6=0

a=m

b=5

c=-6

x=-5+-√5^2-4(M)(-6) over 2(M)

So I get -5+-√25-24/2

-5+-√1/2

-5+1/2=-2 or -5-1/2=-3

That is what I got however the answer is suppose to be -6 and 1... Just wondering where I went wrong.