Find a and b

Find the values of \(a\) and \(b\)

\[ \frac{\sqrt{3} – 1}{\sqrt{3} + 1} = a – b\sqrt{3} \]

Solution:

\[ \frac{\sqrt{3} – 1}{\sqrt{3} + 1} \times \frac{\sqrt{3} – 1}{\sqrt{3} – 1} \]

\[ = \frac{(\sqrt{3} – 1)^2}{3 – 1} \]

\[ = \frac{3 – 2\sqrt{3} + 1}{2} \]

\[ = \frac{4 – 2\sqrt{3}}{2} = 2 – \sqrt{3} \]

Comparing with \(a – b\sqrt{3}\)

\[ a = 2,\quad b = 1 \]

\[ \therefore \text{Correct Answer: Option (a)} \]

Next Question / Full Exercise

Spread the love

Leave a Comment

Your email address will not be published. Required fields are marked *