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Find the unit digit of given expression: x2 - 3x3 + 82, if (x – 3) = 0.

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Find the unit digit of given expression: x2 - 3x3 + 82, if (x – 3) = 0.
1). 6
2). 4
3). 1
4). 0


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1 answers

2 vote
Answered by on | Votes 2 |

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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