Examples

Step 1
Factor using the rational roots test.
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Step 1.1
If a polynomial function has integer coefficients, then every rational zero will have the form where is a factor of the constant and is a factor of the leading coefficient.
Step 1.2
Find every combination of . These are the possible roots of the polynomial function.
Step 1.3
Substitute and simplify the expression. In this case, the expression is equal to so is a root of the polynomial.
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Step 1.3.1
Substitute into the polynomial.
Step 1.3.2
Raise to the power of .
Step 1.3.3
Raise to the power of .
Step 1.3.4
Multiply by .
Step 1.3.5
Subtract from .
Step 1.3.6
Multiply by .
Step 1.3.7
Add and .
Step 1.3.8
Subtract from .
Step 1.4
Since is a known root, divide the polynomial by to find the quotient polynomial. This polynomial can then be used to find the remaining roots.
Step 1.5
Divide by .
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Step 1.5.1
Set up the polynomials to be divided. If there is not a term for every exponent, insert one with a value of .
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Step 1.5.2
Divide the highest order term in the dividend by the highest order term in divisor .
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Step 1.5.3
Multiply the new quotient term by the divisor.
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Step 1.5.4
The expression needs to be subtracted from the dividend, so change all the signs in
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Step 1.5.5
After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.
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Step 1.5.6
Pull the next terms from the original dividend down into the current dividend.
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Step 1.5.7
Divide the highest order term in the dividend by the highest order term in divisor .
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Step 1.5.8
Multiply the new quotient term by the divisor.
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Step 1.5.9
The expression needs to be subtracted from the dividend, so change all the signs in
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Step 1.5.10
After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.
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Step 1.5.11
Pull the next terms from the original dividend down into the current dividend.
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Step 1.5.12
Divide the highest order term in the dividend by the highest order term in divisor .
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Step 1.5.13
Multiply the new quotient term by the divisor.
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Step 1.5.14
The expression needs to be subtracted from the dividend, so change all the signs in
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Step 1.5.15
After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.
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Step 1.5.16
Since the remainder is , the final answer is the quotient.
Step 1.6
Write as a set of factors.
Step 2
Since the polynomial can be factored, it is not prime.
Not prime
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