$\"\"$

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The function is $\"\"$ .

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Identify Possible Rational Zeros:

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It is not practical to test all possible zeros of a polynomial function using only synthetic substitution.

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The Rational Zero Theorem can be used for finding the some possible zeros to test.

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Because the leading coefficient is $\"\"$ , the possible rational zeros are the integer factors of the constant term $\"\"$ .

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Therefore the possible rational zeros of $\"\"$ are $\"\"$ .

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$\"\"$

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The function is $\"\"$ .

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Perform the synthetic substitution method by testing $\"\"$ and $\"\"$ .

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$\"\"$

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Since $\"\"$ , conclude that $\"\"$ is a zero of $\"\"$ .

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Therefore, $\"\"$ is a rational zero.

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The depressed polynomial is $\"\"$ .

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$\"\"$

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Consider $\"\"$ .

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Perform the synthetic substitution method on the depressed polynomial by testing $\"\"$ and $\"\"$ .

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$\"\"$

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Since $\"\"$ , conclude that $\"\"$ is a zero of $\"\"$ .

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Therefore, $\"\"$ is a rational zero.

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The new depressed polynomial is $\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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Therefore $\"\"$ and $\"\"$ are the factors of $\"\"$ .

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$\"\"$

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Factoring the quadratic expression $\"\"$ .

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By using Factor theorem,

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When $\"\"$ then $\"\"$ is a factor of polynomial.

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Factoring of $\"\"$ .

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Zeros are $\"\"$ and $\"\"$ .

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$\"\"$

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The possible rational zeros are $\"\"$ .

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The zeros of $\"\"$ are $\"\"$ .