Answer:

Step-by-step explanation:

1.6x^2+12x-18=0

a=6 b=12 c=-18

(sum of roots)x1+x2=-b/a=-12/6=2

(product of roots)x1×x2=c/a=-18/6=3

2.x^2+4x-21=0

a=1 b=4 c=-21

(sum of roots)x1+x2=-b/a=4/1=4

(product of roots)x1•x2=c/a=-21/1=-21