mathdad
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Factor the expression.
x^4 - 15x^2 + 9
Let u = x^2
Let x^4 = (x^2)^2
u^2 - 15u + 9
Must I use the quadratic formula here or completing the square?
x^4 - 15x^2 + 9
Let u = x^2
Let x^4 = (x^2)^2
u^2 - 15u + 9
Must I use the quadratic formula here or completing the square?