Guest Posted June 2, 2008 Report Share Posted June 2, 2008 Given: A=B Multiply both sides by A A*A=AB Subtract B2 from both sides A2 - B2=AB-B2 Now Factor (A+B)(A-B)=B(A-B) Divide both sides by (A-B) A+B=B Since the given A=B Substitute A for B A+A=A 2A=A Divide by A 2=1 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted June 2, 2008 Report Share Posted June 2, 2008 good one Quote Link to comment Share on other sites More sharing options...
0 Guest Posted June 2, 2008 Report Share Posted June 2, 2008 Given: A=B Multiply both sides by A A*A=AB Subtract B2 from both sides A2 - B2=AB-B2 Now Factor (A+B)(A-B)=B(A-B) Divide both sides by (A-B) A+B=B Since the given A=B Substitute A for B A+A=A 2A=A Divide by A 2=1 You can't divide by (A-B) because A=B, so A-B = 0, so you can't divide by it. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted June 2, 2008 Report Share Posted June 2, 2008 This is an old one.. Whenyou divide by A-B you divide by zero because A=B. Any statement after that is false. Quote Link to comment Share on other sites More sharing options...
0 rookie1ja Posted June 2, 2008 Report Share Posted June 2, 2008 principle already posted here thread locked Quote Link to comment Share on other sites More sharing options...
Question
Guest
Given: A=B
Multiply both sides by A
A*A=AB
Subtract B2 from both sides
A2 - B2=AB-B2
Now Factor
(A+B)(A-B)=B(A-B)
Divide both sides by (A-B)
A+B=B
Since the given A=B Substitute A for B
A+A=A
2A=A
Divide by A
2=1
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