1)

The polynomial is .

Since divides the polynomial, you can find the roots of the polynomial by equating to zero.

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The roots of the polynomial are .

So, we have .

Let us take .

Therefore, .

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Let us say it is equation 1.

Now  .

Let us say it is equation 2.

Solve equation 1 and 2 for a, b.

Add equation 1 and 2.

Now to find the value of a substitute in equation 1.

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The values of a and b are , .