Caitlyn L.

Factorising

Factorise completely:
a4-13a2+3b

Michael J.

I think you have an error here.
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02/26/17

Caitlyn L.

Nope, that's what the question clearly states :)
So is there no way to factorise this?
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02/26/17

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Andrew M.

This answer was obtained by using substitution:
a4 - 13a2 + 36
Let u = a2
u2 - 13u + 36
(u-9)(u-4)
Replace u with a2
(a2-9)(a2-4)
Both are differences of two squares
(a-3)(a+3)(a-2)(a+2)

IF the original was with 36 instead of 3b,
which does seem likely.
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02/27/17

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Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors

Caitlyn L.

I'm not sure if this is what my teacher wants as well, but you're probably right! Thanks so much :)
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02/26/17

Caitlyn L.

I'll get back to you with my teacher's answer.
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02/26/17

Andrew M.

You're welcome.
And, thanks.  I'm curious.

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02/26/17

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