Question

Solve: 10n – n2 = 0
a) n = 0, n = 10
b) n = -10
c) n = 0
d) n = 0, n = -10
e) n = 10

Answer 1

10n - n^2 = n(10 - n) = 0

n = 0 and 10

Answer 2

n(10 - n) = 0
10 - n = 0/n
10 - n = 0 (if n is not 0)
-n = -10
n = 10
n can be 10 and also 0