Question

\log _7\left(3\right)=0.323

Answer 1

`\[\log _7\left(3\right)=0.323\]`
\[\log _7\left(3\right)=0.323\]

Answer 2

You do not really need the left and right tags for a number. (3) works fine alone:

`\(\left(3\right)\)` = \(\left(3\right)\)
`\((3)\)` = \((3)\)

Where those are useful is for fractions and other larger items:

`\(\left(\dfrac{3}{x}\right)\)` = \(\left(\dfrac{3}{x} \right)\)
`\((\dfrac{3}{x})\)` = \((\dfrac{3}{x})\)