Question #4a4b6

1 Answer
Alan P.
Aug 28, 2015

(3+x)-2 = 1+x

Explanation:

Consider the given equations in tabular form so we can see the pattern:
color(white)("XXX"){: ("(",3, "+",color(red)(9),")", -2 ,"=",1,"+", color(red)(9)),("(",3, "+",color(red)(4),")", -2 ,"=",1,"+", color(red)(4)),("(",3, "+",color(red)(90),")", -2 ,"=",1,"+",color(red)( 90)) :}

We can see that except for the two identical columns (in color(red)("red")) all the entries down the table are identical.
Therefore, the color(red)("red") entries become the variable and everything else are constants

Related questions
See all questions in Equations that Describe Patterns
Impact of this question
2931 views around the world
You can reuse this answer
Creative Commons License