Question

1). х²-8х-9=0
2). 3х²+8х-3=0

Answer 1

1. D=(-8)^2 + 4*9= 64+36=100
x1=8-10/2=-1
х2=8+10/2=9
2. D=8^2+3*3*4=64+36=100
х1=-8-10/2=-9
х2=-8+10/2=1

Answer 2

D=64+36=100
X12= 8+-10/2
X1=8+10/2=9
X2=8-10/2=1