SOLUTION: If x+4 is a factor of 4x2+bx−20, what is the value of b?

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Question 874200: If x+4 is a factor of 4x2+bx−20, what is the value of b?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

Using Synthetic divsion

-4 4  b  -20

     -16

   4

-4(b -16) = 20

   b - 16 = -5

    b = 11

4x^2 + 11x -20 = 0

(x+ 4)(4x - 5) - 0