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July 27th, 2014, 03:45 PM  #1 
Newbie Joined: Jul 2014 From: Cohoes, NY Posts: 8 Thanks: 0 Math Focus: NONE!!  Completely Confused
I don't know how many of these things I can post in a day or even an hour. But this one has me completely confused. 9x(5x + 4) + 10(x + 3) Here is my calculation, which was completely wrong (still working with simplifying equations): 9x(5x + 4) + 10(x + 3) 45x + 36x + 10x + 30 19x + 30 Here was the answer the calculator gave me: 9x(5x + 4) + 10(x + 3) Reorder the terms: 9x(4 + 5x) + 10(x + 3) (4 * 9x + 5x * 9x) + 10(x + 3) (36x + 45x^2) + 10(x + 3) Reorder the terms: 36x + 45x^2 + 10(3 + x) 36x + 45x^2 + (3 * 10 + x * 10) 36x + 45x^2 + (30 + 10x) Reorder the terms: 30 + 36x + 10x + 45x^2 Combine like terms: 36x + 10x = 26x 30 + 26x + 45x^2 Last edited by lwhitworth67; July 27th, 2014 at 04:00 PM. Reason: wrong calculation 
July 27th, 2014, 07:13 PM  #2  
Senior Member Joined: Jul 2012 From: DFW Area Posts: 628 Thanks: 92 Math Focus: Electrical Engineering Applications 
Hi lwhitworth67, Quote:
 
July 27th, 2014, 10:48 PM  #3 
Senior Member Joined: Apr 2014 From: Europa Posts: 575 Thanks: 176  

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