Step 1
Find the common denominator.
5/8 and 1/6---------> would be 2³*3----> 24
step 2
multiply (5/8) by (3/3) and (1/6) by (4/4)
5/8-----> 15/24
1/6-----> 4/24
step 3
find the numbers
4/24+15/24------> 19/24
4/24-15/24-------> -11/24
the answer isthe two numbers are19/24 and -11/24see the attached figure
The equation for finding the hypotneus of a right triangle is

so we know that 4²+b²=5²
so that would simplify as 16+b=25
so x=25-16
which is 9
so therefore we can conclude that
-2x^2+8x-10 is your answer!
3.14 my good sir.
hope this helps.