Solve n^2-6n=72 by completing the square

asked Mar 8, 2021 40.7k views

4 votes

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4 votes

Answer:

-6 & 12

Explanation:

[n² - 2(n)(3) + 3²] - 3² = 72

(n-3)² - 9 = 72

(n-3)² = 81

(n-3) = +/- 9

n-3 = 9 n = 12

n-3 = -9 n = -6

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