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(n-3) = -10
n = -7
n^2 - 3n = 49 + 21 = 70
Kalikan kedau ruas dengan (-5)
(n-3) : (-5) x (-5) = 2 x (-5)
Menjadi:
n-3 = -10
Jumlahkan kedua ruas dengan 3
(n-3)+3 = -10 + 3
Menjadi:
n = -7
Dengan demikian:
n² - 3n
= (-7)² - 3(-7)
= 49 + 21
= 70 [C]