(the square root of 18 -3) square with the correct working oooooooooooooooooooooooooooooooooooooo

Answer 1

√18 - 3 = √9 * √2 - 3
= 3√2 - 3

(3√2 - 3)² = (3√2)² - 2 * 3√2 * 3 + 3²
= 9 * 2 - 18√2 + 9
= 18 - 18√2 + 9
= 27 - 18√2

Therefore, the square of √18 - 3 is 27 - 18√2.