Question

if a^2+1/a^2 =18 FIND the value of a+1/a​

Answer 1

Answer:

${a}^{2} + \frac{1}{ {a}^{2} } = 18 \\ adding \: 2 \: on \: both \: sides \\ {a}^{2} + \frac{1}{ {a}^{2} } + 2= 18 + 2 \\ {(a + \frac{1}{a} )}^{2} = 20 \\ a + \frac{1}{a} = \sqrt{20} \: or \: - \sqrt{20}$

Answer 2

Answer:

this is correct...................