Adding and Subtracting Irrational Numbers

When adding or subtracting square roots, what number HAS TO BE THE SAME?

• The number outside the radical sign
• The number inside the radical sign
• The numbers don't matter
• Both have to be the same

√8 - 6√2

• -4√2
• 2√2
• -6√6
• -6√10

√18 + √2

• √20
• 4√5
• 4√2
• 10√2

√18 - √12

• √6
• 3√2 - 2√3
• √2
• 2√3 - 3√2

√98 + 5√2

• 8√3
• 12√2
• 7√2
• 7√3

√5 + √20

• 5
• 25
• 3√5
• 2√3

• A
• B
• C
• D

• A
• B
• C
• D

• A
• B
• C
• D

• A
• B
• C
• D