Simplify the product of the binomial

(5t + 4)^2

F.O.I.L ... multiplying two binomials (or squaring one)

(a+b)^2 = a^2 + 2ab + b^2

You have
a=5t
b=4

To simplify the product of the binomial (5t + 4)^2, we need to use the formula for squaring a binomial:

(a + b)^2 = a^2 + 2ab + b^2

In this case, a = 5t and b = 4. Substituting these values into the formula, we get:

(5t + 4)^2 = (5t)^2 + 2(5t)(4) + (4)^2
= 25t^2 + 40t + 16

Therefore, the simplified version of (5t + 4)^2 is 25t^2 + 40t + 16.