Answer:

-2 po

Step-by-step explanation:

sum of the roots formula is = -b/a

x²+2x-8=0

a=1, b=2

=-2/1

=-2

to prove

x²+2x-8=0

(x+4)(x-2)=0

x+4=0

x=-4

x-2=0

x=2

roots are -4 and 2

so -4+2=-2