Show that 1+3n<n^2 for every positive integer n≥4


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Question Number 142379 by Rexzie last updated on 30/May/21

$S h o w t h a t 1 + 3 n < n^{2} f o r e v e r y p o s i t i v e i n t e g e r n ⩾ 4$
Commented bymr W last updated on 30/May/21

$n ⩾ 4$ $n^{2} ⩾ 4 n = 3 n + n ⩾ 3 n + 4 > 3 n + 1$
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