Use the Rational Roots Test to Find All Possible Roots f(x)=x^4-4x^3-18x^2+108x-135

$f (x) = x^{4} - 4 x^{3} - 18 x^{2} + 108 x - 135$

Step 1

If a polynomial function has integer coefficients, then every rational zero will have the form $\frac{p}{q}$ where $p$ is a factor of the constant and $q$ is a factor of the leading coefficient.

$p = \pm 1, \pm 3, \pm 5, \pm 9, \pm 15, \pm 27, \pm 45, \pm 135$

$q = \pm 1$

Step 2

Find every combination of $\pm \frac{p}{q}$ . These are the possible roots of the polynomial function.

$\pm 1, \pm 3, \pm 5, \pm 9, \pm 15, \pm 27, \pm 45, \pm 135$

Use the Rational Roots Test to Find All Possible Roots f(x)=x^4-4x^3-18x^2+108x-135

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