The answer is 1.063× 10 to the 2nd power
48cm2 is the answer because
<span>2x + 5 =8x
6x = 5
x = 5/6
12x = 12(5/6) = 10</span>
For any equation,

assume solution of a form, 
Which leads to,

Simplify to,

Then find solutions,

For non repeated real root y, we have a form of,

Following up,
For two non repeated complex roots
where,

and,
the general solution has a form of,

Or in this case,

Now we just refine and get,

Hope this helps.
r3t40