write the expression. (6 minus radical -9) (3 minus radical -9)?

Question

write in the form a+bi, where a and b are real numbers.

preal prob please help.

Answer 1

foil
(6 - rad-9)(3 - rad-9) = (6-3i)(3-3i)
foiled is
18 - 18i - 9i + 9i^2
18 - 27i - 9
9 - 27i

Answer 2

[ 6 - √ (- 9 ) ] [ 3 - √ ( - 9 ) ]
18 - 6 √( - 9 ) - 3 √( - 9 ) + ( - 9 )
18 - 9 √ ( - 9 ) - 9
9 - 9 √ ( - 9)
9 - 9 √ ( 9 i ² ) (take + ve square root)
9 - 9 ( 3 ) i
9 - 27 i
9 ( 3 - 3 i )