2x+3 is factor of 2x^3+9x^2-x-b
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Answer:
2x+3=0
x=-3/2
2x*3+9x*2-x-b
2*-3/2+9*-3/2*2-(-3)/2-b=0
-3+9-3-(-3)-b=0
3-6-b=0
-3-b=0
b=3
Hope it Will help u
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