math
posted by john .
Perform the indicated operation(s) and express the result in standard form. Leave answers in terms of square roots (do not use decimals).
(9sqrt3)^2

math 
Henry
(9  sqrt(3))^2 =
(9  sqrt(3*1)^2=
(9  isqrt(3))^2 =
81 + 18isqrt3 + 3 =
3(27 + 6isqrt3 + 1).
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