Surds

Question 1

What is a rational number?

Answer 1

A number that can be written as one integer divided by another integer.

Question 2

What is a Surd

Answer 2

An expression that includes a root. They can be used the write irrational numbers precisely.

Question 3

rtn(ab)

Answer 3

(rtn(a))(rtn(b))

Question 4

How can you add or subtract together surds?

Answer 4

You can add or subtract together surds like normal terms as long as the number inside the root is the same.

Question 5

How can you multiply or divide surds?

Answer 5

You can multiply or divide the coefficient by the coefficient and you multiply or divide the root by the root.

Question 6

How can you rationalise the denominator of a surd?

Answer 6

a/b = ab/(b^2). You can use this to rationalise the denominator.