check whether 2 X + 7 is a factor of 3x³- 7 x
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2x+7=0
2x=-7
x=-7/2
By putting value of x
3 (-7/2)^3-7×-7/2
=3×(-343/8)+49/2
=-1029/8+49/2
No it is not the factor of 3x^3-7x
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