+0

# Find the largest four-digit value of such thatis an integer.

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817
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Find the largest four-digit value of  such thatis an integer.

Guest Jan 31, 2015

#1
+889
+10

Put the expression equal to N (an integer) and square it.

That gets you N^2 =  t- N  or, t = N^2 + N.

The largest integer value for N that can be substituted so that t is still a 4 digit numbe is 99 and that gets

you t = 9900.

Bertie  Feb 1, 2015
Sort:

#1
+889
+10

Put the expression equal to N (an integer) and square it.

That gets you N^2 =  t- N  or, t = N^2 + N.

The largest integer value for N that can be substituted so that t is still a 4 digit numbe is 99 and that gets

you t = 9900.

Bertie  Feb 1, 2015
#2
+92221
+5

That is really neat Bertie

Melody  Feb 1, 2015
#3
+85809
0

Yes it is  !!!!

CPhill  Feb 1, 2015

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