Question

Question #d6ffd

Answer 1

`ab=-1/4`

Explanation:

Equation 1:
`(a+b)^2=1`
`a^2+2ab+b^2=1`

Equation 2:
`(a-b)^2=2`
`a^2-2ab+b^2=2`

Subtracting equation 1 from equation 2:
`(a^2+2ab+b^2)-(a^2-2ab+b^2)=1-2`
`4ab=-1`
`ab=-1/4`