Question

factorise 9a²-166







pls solve this pls​

Answer 1

Step-by-step explanation:

$9 {a}^{2} - 166 \\ = 9 {a}^{2} - {( \sqrt{166}) }^{2 } \\ = (3a + \sqrt{166)} (3a - \sqrt{166} ) \\ 3a + \sqrt{166 } = 0 \: \: \: \: \: \: or \: \: \: \: \: \: 3a - \sqrt{166} = 0 \\ 3a = - \sqrt{166} \: \: \: \: \: \: or \: \: \: \: \: \: 3a = \sqrt{166} = 0 \\ a = \frac{ - \sqrt{166} }{3} \: \: \: \: \: \: or \: \: \: \: \: \: a = \frac{ \sqrt{166} }{3}$

please mark me as brainlist