My Math Forum Checking for Errors in Textbook

 Algebra Pre-Algebra and Basic Algebra Math Forum

 September 21st, 2018, 10:47 AM #1 Newbie   Joined: Aug 2018 From: Utah Posts: 6 Thanks: 0 Checking for Errors in Textbook I have beat my head over this question over and over, and I still can't see how the book gets its answer. I would like you guys to see what you get before I send a note to the author. k × 3^2 − ( j + k ) − 5 ; use j = 4 , k = 5 I get 31 for this, but the book says 36. My guess is that they failed to calculate the " - 5 " at the end. Last edited by skipjack; September 21st, 2018 at 07:32 PM.
 September 21st, 2018, 10:59 AM #2 Senior Member   Joined: May 2016 From: USA Posts: 1,310 Thanks: 551 $j = 4 \text { and } k = 5 \implies k * 3^2 - (j + k) - 5=$ $5 * 3^2 - (4 + 5) - 5 = 5 * 3^2 - 9 - 5 = = 5 * 9 - 14 = 45 - 14 = 31.$ Thanks from topsquark and ProofOfALifetime

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