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123456789^2-2*123456789*123456787+123456787

 Jun 16, 2019
 #1
avatar+19789 
0

123456789^2-2*123456789*123456787+123456787 =  -15241578132906578   by copy and paste into web2.0 calculator

 Jun 16, 2019
 #2
avatar
0

I don’t think that’s correct. Help!

 Jun 16, 2019
 #3
avatar+195 
+1

\(123456789^2-2*123456789*123456787+123456787\)

 

x=123456789

 

Rewrite this as:

x^2-2x(x-2)+x-2

 

(123456787 is 2 less that 123456789 so it can be written as x-2)

 

Now simplify the equation:

 

x^2-2x^2+4x+x-2         distribute -2x

-x^2+5x-2                    combine like terms

 

That can't be factored so I guess that would be as simple as you can get it.

Doing the problem this way would be marginally more efficient, but I still wouldn't want to do that by hand. The problem looks like it is set up to be solved how I solved it, but the numbers didn't work out very well.

 Jun 16, 2019
 #4
avatar
0

(123456789^2) - ((2*123456789*123456787)+123456787)

 

123456789^2 = 1524157 8750190521................................................................(1)
2*123456789*123456787+123456787 = 3048315 7130010673.......................(2)
Subtract (2) from (1):
15,241,578,750,190,521 - 30,483,157,130,010,673
=-15,241,578,379,820,152

 Jun 16, 2019
 #5
avatar+8842 
+2

Is the question supposed to be this:

 

1234567892  -  2 * 123456789 * 123456787  +  1234567872

 

???

 Jun 16, 2019
 #6
avatar
+1

Yes. So sorry for the typo. My apologies 

 Jun 17, 2019
 #8
avatar+7763 
0

 

   1234567892  -  2 * 123456789 * 123456787  +  1234567872

= (123456789 - 123456787)2

= 22

= 4

 Jun 22, 2019

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