Question

which of the following is a surd a) fourth root of 81 b) cube root of 25 c) square root of 16 d) cube root of 125 ​

Answer 1

Surds are numbers left in 'square root form' (or 'cube root form' etc). They are therefore irrational numbers. The reason we leave them as surds is because in decimal form they would go on forever.

b)cube root of 25

=$\sqrt[3]{25}$

The number we get will remain under root, Therefore it is a root.

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Answer 2

Answer:

Which of the following is a irrational number? *

1 point

4th root of 81

Cuberoot of 25

Square root of 16

Cuberoot of 125