Final answer:
To distribute and simplify the given radicals, use the distributive property and rules of simplifying radicals. The expression is 18√{12} + 6 - √{12}.
Step-by-step explanation:
To distribute and simplify the given radicals, we can use the distributive property and the rules of simplifying radicals.
Starting with the first term, (18+ √{3}), we distribute it to both terms inside the second parentheses:
(18+ √{3}) (√{12} - _) = 18√{12} + √{3}√{12} - _√{12}.
Next, we simplify the radicals by finding the product of the numbers inside the radical:
18√{12} + √{3}√{12} - _√{12} = 18√{12} + √{3×12} - _√{12} = 18√{12} + √{36} - _√{12} = 18√{12} + 6 - _√{12}.
This cannot be simplified further, so the expression is 18√{12} + 6 - _√ {12}.