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Factor the expression x^4+8x^2-20??

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x^4+8x^2-20 ..?
Were doing some cubic stuff in class lol
its x^4+8x^2-20 @Algebraic!

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Other answers:

substitute u =x^2
Start wit a substitution to make it simpler: Let u = x^2, then u^2 = x^4. Now re3place the x's with the u's: u^2 + 8u - 20 Can you factor that one?
@mathstudent55 Im not sure.... My teacher didnt really go over this so i have no idea. Would I pull out a 4?
u^2 + 8u - 20 is a quadratic... you've factored a lot of those by now I think....
what two number multiply to give -20 and add to give 8?
@Algebraic! 10 and -2
(u+10)(u-2) = (x^2 +10)(x^2 -2)
(x^2-2) is a difference of squares.. so you can factor that ...
@Algebraic! Okay so what would i do with the other equation?
(x^2+10) ? no real roots...

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