Mathematics Year 12 1st Term

Which of the following is a rational number?

• 2√2

• 7/3

• 5√5

• 3 + 2√3

Which of these expressions is a surd?

• 16/4

• 0.75

• √7

• 81/9

Which of the following is an irrational number?

• √36

• 2.5

• 1/2

• √11

• 3√3

• 6√2

• 9√3

• 6√3

Which of the following is the conjugate of 3 + √5?

• 3 - √5

• √5 - 3

• -3 + √5

• -3 - √5

Rationalize the denominator of 1/√3.

• √3/2

• √3/3

• 3√3

• 3√3

Solve (3 + 2)(3 - 2)(3 + √2)(3 - √2).

• 7

• 5

• 9

• 11

• 10

• 15

• 20

• 25

Simplify √50/√2.

• √25

• 5√2

• √100

• 10

Evaluate 1/(√5 - 2) by rationalizing the denominator.

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