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Why do we need to put linear numerators of the form Bix+Ciin every term of a partial-fraction decomposition which involves irreducible quadratics? Think about the example pxqx=1x2+12and figure out what goes wrong if we attempt to make a decomposition of the formC1x2+1+C2x2+12.

Short Answer

Expert verified

The qx=1x2+1, whichis a reducible quadratic then qxis a product of l1xand l2xof two linear functions. So,l1x=x-1,l2x=x-2.

Step by step solution

01

Step 1. Given information

pxqx=1x2+12.

02

Step 2. Let us see some concepts about qx.

If qxis an irreducible quadratic then pxqxis its own partial fractions decomposition, there is nothing further we can decompose.

If qxis a reducible quadratic then qxis a product of l1x.l2xof two linear functions and the obtain a partial function decomposition of the form A1l1x+A2l2x.

The given function is, qx=1x2+1.

So,l1x=x-1,l2x=x-2.

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