Answer:

-3 or 5

Step-by-step explanation:

k^2 -2k-15=0

(k-5)(k+3)=0

k=5 or k=-3

Answer:

Option b

hope it helps you!!

Step-by-step explanation:

√(k - 1)² + (1 - 4)² = 5

=>√(k - 1)² + (-3)² = 5

=> √ (k - 1)² + 9 = 5

squaring both side

(k - 1)² + 9 = 5²

=> (k - 1)² = 25 - 9

=> (k -1)² = 16

=> k - 1 = ± 4

=> k = 5 or -3