Question 101

If $$p^3 - q^3 = (p-q)\left\{(p-q)^2 - xpq\right\}$$, then find the value of $$x$$ is

Solution

Given,     $$p^3-q^3=\left(p-q\right)\left(\left(p-q\right)^2-xpq\right)$$

               $$p^3-q^3=\left(p-q\right)\left(p^2+q^2-2pq-xpq\right)$$

              $$p^3-q^3=\left(p-q\right)\left(p^2+q^2+\left(-2-x\right)pq\right)$$ ..............(1)

We know that

              $$p^3-q^3=\left(p-q\right)\left(p^2+q^2+pq\right)$$ .................................(2)

Comparing both the equations we get

                     $$-2-x=1$$

   $$=$$>                      $$x=-3$$


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