play quizzes ad-free

Just For Fun Quiz / Find the Mistake: 2=1 Proof

Random Just For Fun or Math Quiz

Can you name the mistake in this proof that 2=1?

 Plays Quiz not verified by Sporcle

How to PlayMinefieldWrong Answers
Challenge
Share
Tweet
Score
  • Numerical Score
  • Percentage
 0/10 Timer
  • Default Timer
  • Stopwatch
 04:00
ProofWhere is it?Explanation
Do this!It is required!
1. x=y≠0Given
2. x^2=xyMultiply by x
3. x^2-y^2=xy-y^2Subtract y^2
4. (x+y)(x-y)=y(x-y)Factoring
5. x+y=yDividing by x-y
6. y+y=ySubstitution: x=y
7. 2y=yCombining like terms
8. 2=1Dividing by y, knowing y≠0
Is there any mistake in the proof?(Fills in upon completion of the quiz)
play quizzes ad-free

You're not logged in!

Compare scores with friends on all Sporcle quizzes.
Join for Free
OR
Log In

You Might Also Like...

Crazy Number Logic Puzzle II
Shape Venn Diagram IV
Mini Sudoku II
Mini Sudoku IV
hide this ad

Show Comments

Extras

Top Quizzes Today


Score Distribution

hide this ad

Your Account Isn't Verified!

In order to create a playlist on Sporcle, you need to verify the email address you used during registration. Go to your Sporcle Settings to finish the process.

Report this User

Report this user for behavior that violates our Community Guidelines.

Details: