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-1 = 1?

Please help by looking at the attachment attached.
help me to disprove it while accepting the square of a negative number
image.jpg317.0KB
Original post by cmark
Please help by looking at the attachment attached.
help me to disprove it while accepting the square of a negative number


Look at line 2, already a mistake (not the only one), it should be:

±−1\pm \sqrt {-1}

Then see how the rest of the lines make the same mistake.
(edited 8 years ago)
I think it is because the square root of -1 is rt(-1) or -rt(-1) so when you make it to the end, you should get +/- (-1) = +/- (1) if you include the +/- sign throughout rather than only taking the "positive" value of rt(-1)
Original post by BobFredric
I think it is because the square root of -1 is rt(-1) or -rt(-1) so when you make it to the end, you should get +/- (-1) = +/- (1) if you include the +/- sign throughout rather than only taking the "positive" value of rt(-1)

Sup bob

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