2a+b4.....................
3 minutes and 36 seconds is the length of "Shake it off" by Taylor swift.
Source: Wikipedia
we know that
step 1
multiply
by 
so

step 2
Divide numerator and denominator by 

therefore
the answer is

The algebra tiles show two equal factors. They are (x + 4).
Then, the perfect square is the product of the two equal factors, (x + 4) * (x +4).
That is (x + 4)^2.
Then develop that perfect square to find the constant term.
(x + 4)^2 = x^2 + 8x + 16.
That means that the constant term needed to complete the trinomial is 16.
Answer: 16