check wheather 7+3x is a factor of3x³+7x
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for checking factor
let 7+3x=0
subst x= -7/3 in the eqn
we get 3(-7/3)^3 +7(-7/3)
=343/9 - 49/3
=196/9
=21.777.....
it is not equal to zero ,thus it is not a factor
let 7+3x=0
subst x= -7/3 in the eqn
we get 3(-7/3)^3 +7(-7/3)
=343/9 - 49/3
=196/9
=21.777.....
it is not equal to zero ,thus it is not a factor
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