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Solving a Quadratic Equation by Factorization Method

If np2=56, th...

Question

If np2=56, then find n

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Solution

np2 = 56

n(n - 1) = 56
n² - n - 56 = 0
(n - 8)(n + 7) = 0
n = -7 and 8

n wouldn't be negative here, so:

n = 8.

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