What is the completely factored form of x squared minus 16 x y plus 64 y squared ?

The expression is a perfect-square trinomial: x² − 16xy + 64y². Since 64y² = (8y)² and the middle term −16xy equals −2(x)(8y), it factors as (x − 8y)². This matches “(x − 8y) times (x − 8y).”

AI-written and checked against the verified answer.