Practice free →
HomeZIMSEC O-LevelMathematicsExponents and surds › Rationalising the denominator of 6 divided by th…

Rationalising the denominator of 6 divided by the square root of 3 gives which expression?

A3 times the square root of 2
B6 times the square root of 3
CThe square root of 18
D2 times the square root of 3
Answer & Solution
Correct answer: D. 2 times the square root of 3
1. The denominator holds a surd, so the fraction is rewritten with a rational denominator. 2. Multiply the fraction by the square root of 3 over the square root of 3. 3. That value is equal to 1, so the value of the fraction does not change. 4. The numerator becomes 6 times the square root of 3. 5. The denominator becomes the square root of 3 times itself, which is 3. 6. Dividing 6 by 3 leaves 2, so the answer is 2 times the square root of 3. 7. Answering 6 times the square root of 3 forgets to divide by the new denominator. 8. The square root of 18 is the numerator alone with the 6 taken inside the root sign. _Source: Siyavula Mathematics Grade 11 (Everything Maths, CC BY 4.0), Chapter 1: Exponents and surds_
Solve this in the app — ZIMSEC O-Level practice & 24k+ MCQs →
Related questions