Division of Polynomial by another Polynomial Long Division


 
 
Concept Explanation
 

Division of Polynomial by another Polynomial Long Division

Division of a polynomial by a binomial by using long division

For dividing a polynomial by a binomial, we may follow the following steps:

Step I: Arrange the terms of the dividend and divisor in descending order of their degrees.

Step II: Divide the first term of the dividend by the first term of the divisor to obtain the first term of the quotient.

Step III: Multiply the divisor by the first term of the quotient and subtract the result from the dividend to obtain the remainder.

Step IV: Consider the remainder  (if any)  as dividend and repeat step II to obtain the second term of quotient.

Step V: Repeat the above process till we obtain a remainder which is either zero or a polynomial of degree less than that of the divisor.

Example 1    Divide large 6+x-4x^{2} + x^{3};;by;;x-3.

Solution: We go through the following steps to perform the division:

Step I:  We write the terms of the dividend as well as of divisor in descending order of their degrees. Thus, we write                     large dpi{120} large 6+x-4x^{2}+x^{3};;as;;x^{3}-4x^{2}+x+6;;and;;x-3;;as;;x-3

Step II:  We divide the first term large x^{3} of the dividend by the first term large x of the divisor and obtain     large frac{x^{3}}{x}=x^{2} as the first term of the quotient.

Step III:  We multiply the divisor large x-3  by the first term large x^2 we get large x^3-3x^2   of the quotient and subtract the result from the dividend  large x^{3}-4x^{2}+x+6. We obtain large -x^{2}+x+6  as the remainder.

Step IV : We take large -x^{2}+x+6 as the new dividend and repeat step II to obtain the second  term large (-frac{x^{2}}{x}=)-x of the quotient.

Step V :  We multiply the divisor large x-3 by the second term large -x of the quotient and subtract the result large -x^{2} + 3x from the new dividend. We obtain large -2x + 6 as the remainder.

Step VI :  Now we treat large -2x + 6 as the new dividend and divide its first term large -2x by the first term large x of the divisor to obtain large frac{-2x}{x}=-2 as the third term of the quotient.

Step VII : We multiply the divisor large x-3 and the third term large -2 of the quotiemt and subtract the result large -2x+6 from the new dividend. We obtain large 0 as the remainder. Thus, we can say that: large (6+x-4x^{2}+x^{3})div (x-3)=x^{2}-x-2or,                large frac{6+x-4x^{2}+x^{3}}{x-3}=x^{2}-x-2

Example:  Divide   large 2x^3-4x^2+x+6;;by;;2x-3

Solution:

                             

Sample Questions
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Question : 1

If on division of a polynomial p(x) by a polynomial g(x), the quotient is zero, then the relation between the degrees of p(x) and g(x) is

Right Option : A
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Question : 2

If x^{3}+11 is divided by x^{2}-3 then the possible degree of remainder is

Right Option : D
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Question : 3

The coefficient of the first term of the quotient when the polynomial p(x)=   x^{3}+4x^{2}+9-x is divided by g(x)=x+1 is  ____________________

Right Option : B
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Explanation
 
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