Q2 of 227 Page 92

Find the other polynomial q(x) of each of the following, given that LCM and GCD and one polynomial p(x) respectively.

(x3 – 4x) (5x + 1), (5 x2 + x), (5 x3 – 9 x2 – 2x).

Given: –


Polynomials p(x) = (5x3 – 9x2 – 2x)


And GCD[Greatest Common Divisor] = (5x2 + x)


And LCM[Lowest Common Multiple] = (x3 – 4x)(5x + 1)


Formula used: –


The product of 2 polynomial is equal to product of their LCM


and GCD.


Product of 2 polynomial = LCM × GCD


p(x) × q(x) = LCM × GCD


LCM × GCD = (x3 – 4x) (5x + 1) × (5x2 + x)


= x(x2 – 4)(5x + 1) × x(5x + 1)


= x2(x + 2)(x – 2)(5x + 1)(5x + 1)


p(x) = (5 x3 – 9 x2 – 2x)


= x(5x2 – 9x – 2)


= x(5x2 – 10x + x – 2)


= x[5x(x – 2) + 1(x – 2)]


= x(5x + 1)(x – 2)


p(x) × q(x) = LCM × GCD


q(x) =


q(x) =


q(x) =


q(x) = x(x + 2)(5x + 1)


Conclusion: –


The other polynomial term q(x) is x(x + 2)(5x + 1)


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