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x^4+8x^2-20 ..?

Were doing some cubic stuff in class lol

its x^4+8x^2-20 @Algebraic!

substitute u =x^2

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...