Hello, M.R!

Normally, we could stop where you did.

. .

. .

. .

Answer: .

. . Usually, "factoring" meanscoefficients.integer

But they pulled a cute trick and took it a step further.

That quartic polynomial, , can be factored

. .we're desperate enough.if

We have: .

Add and subtract

So we have: . . . . a difference of squares!

Factor: .