diannakimmmy diannakimmmy

10-09-2016
Mathematics

contestada

x^4-10x^2+9 how do I factor this?

Respuesta :

jhonyy9 jhonyy9

11-09-2016

x^2 = y and rewrite your exercise

y^2 -10y +9 = y*y -y -9y +9 = y(y -1) -9(y -1) = (y -9)(y -1)
and now rewrite using this above wrote note of x^2 = y

so will get (y -9)(y -1) = (x^2 -9)(x^2 -1)

and this mean that

x^4 -10x^2 +9 = (x^2 -9(x^2 -1)

hope helped

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