Question 1
Rationalise the denominator.
9
√7-2

Step-by-step explanation:

Rationalizing the Denominator

Rationalizing the denominator means to get rid of any radicals in the denominator.

We use the conjugate of the denominator to rationalize. The conjugate of a binomial is obtained by changing the sign that is between the two terms while keeping the same order of the terms. For example, the conjugate of

is .

We need to use the algebraic identity:

Let's rationalize

Multiply numerator and denominator by the conjugate of the denominator:

Operate in the numerator and apply the identity in the denominator

Dividing:

this is false ^.^ lol