Adding and subtracting irrational numbers

Only _____________________________ can be combined when adding and subtracting radicals.

• Like radical expressions

• Unlike radical expressions

• radicals with the same index

• radicals with different indexes.

 $Evaluate\ \sqrt{225\ }\ \ +\ \sqrt{169}\ .$  

 $2\sqrt{3}+\ \sqrt{3}$  is equal to 

•  $2\sqrt{6}$  

• 6

•  $3\sqrt{3}$  

•  $4\sqrt{6}$  

Subtract: 2√18 - 3√8

• 0

• 3√2

• √2

• -4√2

 $\sqrt[4]{x^6}-2\sqrt[4]{x^6}=$  

•  $-x\sqrt[4]{x^2}$  

•  $3\sqrt[4]{x^6}$  

•  $-2x$  

•  $3.2$  

Simplify

-2√2 - 3√8 - √5

• -8√2 - √5

• -8√2 - √9

• -14√3 - √7

• -2√4 - √3

Find the value of 2√4 +3∛8

• 10

• ไม่มีคำตอบที่ถูกต้อง

• 32

• 12