Find the unit digit of given expression: x2 - 3x3 + 82, if (x – 3) = 0.
1). 6
2). 4
3). 1
4). 0
x – 3 = 0
⇒ x = 3
Put x = 3 in eq. x2$ - 3x3$ + 82
⇒ 32$ - 3(3)3$ + 82
⇒ 9 – 81 + 82
⇒ 10
∴ Unit digit of expression = 0
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