Question

Multiply and simplify: quantity 9 + 2 radical 3 times quantity 9 minus 2 radical 3

Answer 1

get the binomial pairs

\[(9 + 2\sqrt{3})(9 - 2\sqrt{3})\]

this expands to the difference of 2 squares

(a +b)(a -b) = a^2 - b^2

use this method

should get 69 as the answer

Answer 2

thanks your a real help :)