Find B if: (A+B)=(C+D)  TOPIC_SOLVED

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Find B if: (A+B)=(C+D)

Postby Catalin_a on Fri Jan 25, 2013 5:58 pm

Guys... I need help :confused: how do I solve this simple equation ?

Find b if: (a+b)=(c+d)
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Re: Find B if: (A+B)=(C+D)

Postby jg.allinsymbols on Sat Jan 26, 2013 12:23 am

Catalin_a wrote:Guys... I need help :confused: how do I solve this simple equation ?

Find b if: (a+b)=(c+d)



The parentheses for the lefthand and right hand members are not needed since nothing else on either side interferes with communication or meaning.

a+b=c+d.
Add the additive inverse of a to both sides and you are done.
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Re: Find B if: (A+B)=(C+D)

Postby Catalin_a on Sat Jan 26, 2013 4:18 am

Thank you for reply, but how can I add the additive inverse of a to both sides when a is only on one side.

Can some one please solve this, I will have more sense if I can see it solved.

Please excuse my english, I am not an english speaker.
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Re: Find B if: (A+B)=(C+D)  TOPIC_SOLVED

Postby jg.allinsymbols on Sat Jan 26, 2013 6:16 am

Catalin_a wrote:Thank you for reply, but how can I add the additive inverse of a to both sides when a is only on one side.

Can some one please solve this, I will have more sense if I can see it solved.

Please excuse my english, I am not an english speaker.


Surely, a is on one side but not the other. The number a and its additive inverse are different numbers. You want to add THE ADDITIVE INVERSE of a to BOTH SIDES of the equation so that you can eliminate a from one side and to maintain equality.

Essentially you want to subtract a from both sides. The idea is that a + -a = 0
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Re: Find B if: (A+B)=(C+D)

Postby maggiemagnet on Sun Jan 27, 2013 8:49 pm

You can see examples for one-variable equations here and for "literal" equations (like yours) here.
:clap:
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Re: Find B if: (A+B)=(C+D)

Postby karadimos on Mon Jan 28, 2013 8:31 pm

A + B = C + D
subtract A from both sides

B = C + D - A

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