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The question:
7 x^{3} -3 x^{2} -21x+9
 x^{2} (7x-3)-3(7x-3)
( x^{2} -3)(7x-3)
( x^{2} -( \sqrt{3})^{2}  )(7x-3)
(x+ \sqrt{3} )(x- \sqrt{3} )(7x-3)
Ans:(x+ \sqrt{3} )(x- \sqrt{3} )(7x-3)
1 5 1
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