Problem #1

Simplify by combining like terms.
x�ã(18) -3�ã(8x^2)

My answer: -3x�ã(2)

Problem #2
Simplify each radical expression.
(�ã(3) + 5)(�ã(3) - 3)
My answer: -12

see my previous post, don't understand your symbol ã

sorry they are radicals