`x^2 - 6x + 9 = 0`
`x^2 - 7x + 8 = 0`
`x^2 - 14x + 49 = 0`
`x^2 - 10 x + 21 = 0`
`- pi`
`pi`
`pi/2`
`1`
`0`
`-6`
`1`
`oo`
`2,2`
`1,2`
`2,1`
`2,0`
`1`
`1/2`
`1/4`
`1/8`
`1/sqrt2`
`1/2`
`1`
`2`
`3`
`2`
`1`
`-1`
2
1/2
0
1
`e`
`1/e`
`-1`
`e^pi`
`1`
`e^(b-a)`
`e^(a-b)`
`e^b`
`1/e`
`e`
`1`
`0`
`0`
`1`
`1/e`
None of these
`1/2`
`1`
`2`
`0`
`0`
`1`
`−1`
Does not exist
`1`
`0`
`-1`
Does not exist
`-1`
`0`
`1`
`2`