equation of sum: r∨1+r∨2 = -b/a
equation of product: r∨1×r∨2= c/a
1. x2+4x+3 = 0
a=1; b=4; c=3
the sum is -4 and product is 3
2. 6x2+12x-18 = 0
a=6; b=12; c=-18
the sum is -2 and product is -3
3. x2+4x-21 = 0
a=1; b=4; c=-21
the sum is -4 and product is -21
4.2x2+3x-2 = 0
a=2; b=3; c=-2
the sum is -3/2 and product is -1
5. 3x2-10x-8 = 0
a=3; b=-10; c=-8
the sum is 10/3 and product is -8/3
6. 4x2+8x+3 = 0
a=4; b=8; c=3
the sum is -2 and product is 3/4
7. 9x2-6x+8 = 0
a=9; b=-6; c=8
the sum is 2/3 and product is 8/9
8. 8x2-6x+9 = 0
a=8; b= -6; c=9
the sum is 3/4 and product is 9/8
9. 10x2-9x+6 = 0
a=10; b=-9; c=6
the sum is 9/10 and product is 3/5
