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29-10-2018
Mathematics

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Solve for the unknown:8k-k2=42

and tell me how you did it I have no ideal how

Respuesta :

Аноним Аноним

29-10-2018

Answer:

k = 4 + 5.10i , 4 - 5.10i

Step-by-step explanation:

8k - k^2 = 42

k^2 - 8k + 42 = 0

Completing the square:-

(k - 4)^2 - 16 +42 = 0

(k - 4)^2 = -26

k- 4 = +/-sqrt26

k = 4 + sqrt26 or 4 - sqrt26

k = 4 + 5.10i , 4 - 5.10i

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