## ASVAB Arithmetic Reasoning Practice Test 813198

Question 1 of 5
To add or subtract radicals, the degree and radicand must be the same. For example, $$2\sqrt{3} + 3\sqrt{3} = 5\sqrt{3}$$ but $$2\sqrt{2} + 2\sqrt{3}$$ cannot be added because they have different radicands.
What is $$8$$$$\sqrt{63}$$ - $$9$$$$\sqrt{7}$$
 -1$$\sqrt{9}$$ -1$$\sqrt{441}$$ 15$$\sqrt{7}$$ 72$$\sqrt{7}$$