Given:
The given quadratic equation is

or, 
And
The roots are given: 
To find the missing step.
Let us solve the equation.

or, 
or,
[ eliminating 16 from both the side]
or, 
or, 
or, 
Hence,
The step 2 could be 
Answer would be 0 because whatever you get when you plug in g&h in the equation you have to multiply that by 0. And a number multiplied by 0 is always 0.
Hope this helped. Have a great day!
Answer:
20x^3/4x7
20/4x^4
5/x^4
Step-by-step explanation: