Question

need help with adding and subtracting radicals

Answer 1

Need to see actual problems. Please post whatever you're working on. Thx

Answer 2

You never add or subtract the numbers under the radical. You add/subtract the factors outside of the radical.

You can only add/subtract radicals when the number or expression under the radical are exactly the same.

Answer 3

\[2\sqrt{5}+5\sqrt{5}\]

\[2\sqrt{k}+\sqrt{k}-3\sqrt{k}\]

\[r \sqrt{t}+s \sqrt{t}\]

\[a \sqrt{x}+b \sqrt{y}-c \sqrt{x}\]

\[4m+5\sqrt{n}-m+6m-3\sqrt{n}\]

\[\sqrt{9m^2n^2}+2\sqrt{m^2n^2}-3mn\]