Answer:
a*b=(-7)
a+b=(-2)
Represent a with b -> a=(-2)-b
Instead of a write (-2-b) in the first equation -> b*(-2-b)=-b^2-2b=7
b^2+2b-7=0
Solving this b=-1-2√2 and b=-1+2√2
Since a was equal -2-b we have these two solutions (a=(-1+2√2);b=(-1-2√2)) and (a=(-1-2√2);b=(-1+2√2))
Because the answers we got are the same only replaced we that numbers are (-1+2√2);(-1-2√2)). But write both answers to avoid any mistakes/misunderstanding.
