Consider a function g(x) continuous at x = 0 where
\(g\left( x \right) = \frac{{({{128}^x} - {4^x})}}{{{a^x} - 1}}\;for\;x \ne 0\)
\( = 5\;for\;x = 0\)
What is the value of a?Enter numerical value using the virtual keypad. Round off where necessary.