Question by taylor swift - Discuss with MathYouLike

taylor swift

19/03/2017 at 12:59

It is given n is a positive integer . The units digit of n² is 9 and the units digit of (n+1)² is 6. The units digit of (n-1)² is

Multiplication of Polynomial

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FA KAKALOTS 06/02/2018 at 12:39

The units digit of n2 is 9,so the unit digit of n can be 3 or 7 (because 32 = 9 ; 72 = 49)

The units digit of (n + 1)2 is 6,so the unit digit of n + 1 can be 4 or 6

We see 3 + 1 = 4,so the units digit of n is 3 and the units digit of n - 1 is 2.Hence the units digit of (n - 1)2 is 4
»ﻲ2004#ﻲ« 29/03/2017 at 06:13

The units digit of n2 is 9,so the unit digit of n can be 3 or 7 (because 32 = 9 ; 72 = 49)

The units digit of (n + 1)2 is 6,so the unit digit of n + 1 can be 4 or 6

We see 3 + 1 = 4,so the units digit of n is 3 and the units digit of n - 1 is 2.Hence the units digit of (n - 1)2 is 4
Phan Thanh Tinh Coordinator 23/03/2017 at 17:42

The units digit of n² is 9,so the unit digit of n can be 3 or 7 (because 3² = 9 ; 7² = 49)

The units digit of (n + 1)² is 6,so the unit digit of n + 1 can be 4 or 6

We see 3 + 1 = 4,so the units digit of n is 3 and the units digit of n - 1 is 2.Hence the units digit of (n - 1)² is 4

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