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Factorization with substitution

Problem

We want to factor the following expression:
left parenthesis, x, plus, 4, right parenthesis, squared, minus, 4, y, start superscript, 5, end superscript, left parenthesis, x, plus, 4, right parenthesis, plus, 4, y, start superscript, 10, end superscript
We can factor the expression as left parenthesis, U, minus, V, right parenthesis, squared where U and V are either constant integers or single-variable expressions.
1) What are U and V?
Choose 1 answer:
Choose 1 answer:
2) Factor the expression.
Stuck?
Stuck?