Check whether 7+3x is factor of 3xcube + 7x
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Answered by
5
When we Factroise 7 + 3x we get 7 + 3 × x
when we factorise 3xcube +7x we get 3 × x × x × x + 7× x when we take x common we get x(3x square + 7).
but 3x square is not equal to 7 + 3x so it is not the factor of 33 square + 7
when we factorise 3xcube +7x we get 3 × x × x × x + 7× x when we take x common we get x(3x square + 7).
but 3x square is not equal to 7 + 3x so it is not the factor of 33 square + 7
Answered by
4
7+3x = 0
3x= -7
x= -7/3
put this value in polynomial 3xcube + 7x
= 3×(-7/3)^3 + 7(-7/3)
=-343/81 - 49/3
= -343/81 - 49×27/3×27
=-343/81-1323/81
=(-343-1323)/81
=-1666/81
not equal to zero
so it is not a factor of polynomial.
3x= -7
x= -7/3
put this value in polynomial 3xcube + 7x
= 3×(-7/3)^3 + 7(-7/3)
=-343/81 - 49/3
= -343/81 - 49×27/3×27
=-343/81-1323/81
=(-343-1323)/81
=-1666/81
not equal to zero
so it is not a factor of polynomial.
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