# College Algebra

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x^3-5x^2+4x-20 > 0 interval notation

• College Algebra -

factor by grouping
x^2(x-5) + 4(x-5) > 0
(x-5)(x^2+ 4) > 0

x^2 + 4 is always positive, so for the whole thing to be positive
x-5 > 0
x > 5

express it in the form you were taught.

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