Final answer:
To simplify the expression 7√3 * 9√3, multiply the coefficients (7*9 = 63) and multiply the radicals (√3 * √3 = 3). The simplified expression is 189.
Step-by-step explanation:
To simplify the expression 7√3 * 9√3, we can multiply the coefficients (7*9 = 63) and multiply the radicals (√3 * √3 = 3). Combining these results, we get 63 * 3 = 189. Therefore, the simplified expression is 189.