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Factor the polynomial expression [tex]$16y^4 - 625x^4$[/tex].

[tex]$16y^4 - 625x^4 = ($[/tex]
____
[tex]$)($[/tex]
____
[tex]$)$[/tex]

Expressions available:

- [tex]$y$[/tex]
- [tex]$4y^2 + 25x^2$[/tex]
- [tex]$25x$[/tex]
- [tex]$2y$[/tex]
- [tex]$4y^2$[/tex]
- [tex]$5x$[/tex]
- [tex]$4y$[/tex]
- [tex]$4y^2 - 25x^2$[/tex]

Answer :

Let's factor the polynomial expression [tex]\(16y^4 - 625x^4\)[/tex].

The expression is in the form of a difference of squares. The difference of squares formula is:

[tex]\[
a^2 - b^2 = (a - b)(a + b)
\][/tex]

First, we need to identify [tex]\(a\)[/tex] and [tex]\(b\)[/tex] such that:

1. [tex]\(a^2 = 16y^4\)[/tex]
2. [tex]\(b^2 = 625x^4\)[/tex]

We find [tex]\(a\)[/tex] and [tex]\(b\)[/tex] by taking the square roots:

- For [tex]\(a\)[/tex], we recognize [tex]\(16y^4\)[/tex] as [tex]\((4y^2)^2\)[/tex]. Thus, [tex]\(a = 4y^2\)[/tex].
- For [tex]\(b\)[/tex], we recognize [tex]\(625x^4\)[/tex] as [tex]\((25x^2)^2\)[/tex]. Thus, [tex]\(b = 25x^2\)[/tex].

Now, apply the difference of squares formula:

[tex]\[
16y^4 - 625x^4 = (4y^2)^2 - (25x^2)^2 = (4y^2 - 25x^2)(4y^2 + 25x^2)
\][/tex]

Next, let's check if the first expression, [tex]\(4y^2 - 25x^2\)[/tex], can be further factored. Notice that:

- [tex]\(4y^2\)[/tex] is [tex]\((2y)^2\)[/tex] and
- [tex]\(25x^2\)[/tex] is [tex]\((5x)^2\)[/tex],

So, [tex]\(4y^2 - 25x^2\)[/tex] is also a difference of squares:

[tex]\[
4y^2 - 25x^2 = (2y - 5x)(2y + 5x)
\][/tex]

The second expression, [tex]\(4y^2 + 25x^2\)[/tex], does not factor further using real numbers because it's a sum and not a difference.

Putting everything together, the factorization of [tex]\(16y^4 - 625x^4\)[/tex] is:

[tex]\[
(2y - 5x)(2y + 5x)(4y^2 + 25x^2)
\][/tex]

This is the fully factored form of the given polynomial.

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