Question

if bracket X + K is a factor of polynomial x square - 2 x minus 15 and x cube + a find the value of k and a​

Answer 1

(x+k) means x=-k

x2-2x-15

(-k)2-2(-k)-15=0

k2+2k-15=0

k2+5k-3k-15=0

k(k+5)-3(k+5)

(k-3) (k+5)

k=3, -5

x3+a

(-k)3+a

a=k

a = 27 , -125

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Answer 2

Answer:

SEE THAT ATTACHED PHOTO....

Step-by-step explanation:

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