SOLUTION: Multiply (9+ the square root of 10) by (9- the square root of 10). Simplify and type an exact answer using radicals as needed.

Algebra ->  Square-cubic-other-roots -> SOLUTION: Multiply (9+ the square root of 10) by (9- the square root of 10). Simplify and type an exact answer using radicals as needed.      Log On


   

Question 401431: Multiply (9+ the square root of 10) by (9- the square root of 10). Simplify and type an exact answer using radicals as needed.
Answer by sofiyac(983) About Me  (Show Source):
You can put this solution on YOUR website!
%289%2Bsqrt%2810%29%29%289-sqrt%2810%29%29=81-10=70
you use the difference of squares formula here
%28a%2Bb%29%28a-b%29=a%5E2-b%5E2