SOLUTION: Please help. I need help with learning how to solve the product of a binomial and a conjugate. Here is an example: 1 - square root 7 Conjugate= 1 + square root 7 What

Algebra ->  Radicals -> SOLUTION: Please help. I need help with learning how to solve the product of a binomial and a conjugate. Here is an example: 1 - square root 7 Conjugate= 1 + square root 7 What       Log On


   

Question 802026: Please help. I need help with learning how to solve the product of a binomial and a conjugate. Here is an example:
1 - square root 7

Conjugate= 1 + square root 7
What should be the next step?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
1+-+sqrt%287%29 * 1+%2B+sqrt%287%29
FOIL, (square root of 7 times the square root of 7 is 7)
1+%2B+sqrt%287%29+-+sqrt%287%29+-+7
Note the middle terms cancel leaving just
1 - 7 = -6 is the product