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Find k so that x+4 is a factor of x²-kx+8

Sagot :

Answer:

k is equal to -6

Step-by-step explanation:

(x+4)*(x+2)=[tex]x^{2}[/tex]+6x+8

now since 6 is postive and k is negative 2 negative make a positive so 6 becomes -6

if we substitute -6 to k it becomes x^2+-(-6)x+8=[tex]x^{2}[/tex]+6x+8

this confirms that -6 is the answer

hope this helps