Gujarati
8. Sequences and Series
easy

The $G.M.$ of roots of the equation ${x^2} - 18x + 9 = 0$ is

A

$3$

B

$4$

C

$2$

D

$1$

Solution

(a) Let $\alpha $ and $\beta $ be the roots of equation ${x^2} – 18x + 9 = 0$

$\therefore $ $G.M.$ of $\alpha $ and $\beta $$ = \sqrt {\alpha \beta } = \sqrt 9 = 3$.

Standard 11
Mathematics

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