The expressions (x+4) is a factor of x2+kx-20 what is the value of k how do you know

k = -1

Step-by-step explanation:

You're given (x+4) as one of the factor for the equation

x² + kx - 20 = 0

what number does 4 multiply with to get -20? It's -5.

So

= (x+4)(x-5)

= x² + -1x - 20

= x² + kx - 20

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