Find value of b for which 2x3 + 9x2 - x - b is exactly divisible by 2x + 3.
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x = -3/2
Substitute it
2(-27/8) + 9(9/4) + 3/2 = b
-27/4 + 81/4 + 6/4 = b
b = 15
Substitute it
2(-27/8) + 9(9/4) + 3/2 = b
-27/4 + 81/4 + 6/4 = b
b = 15
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