Answer
$49t^2-56t+16$.
Work Step by Step
The given expression is
$=(-7t+4)^2$
$=(4-7t)^2$
Use formula $(a-b)^2=a^2-2ab+b^2$.
We have $a=4$ and $b=7t$.
$=(4)^2-2(4)(7t)+(7t)^2$
Simplify.
$=16-56t+49t^2$
Standard form.
$=49t^2-56t+16$
Hence, the product is $49t^2-56t+16$.
