Question #d6ffd

1 Answer
Aug 4, 2017

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