calc problem

[lulln]

View attachment 17628

thanks for your help. May I ask you another problem?

 

[Steven G]

add and subtract 1/4 both sides?
x^2+x-1=0
(x^2+x+1/4)-1/4-1=0

You added and subtracted 1/4 on one side, not both sides of the equal sign. It is dangerous to say what you said as in other problems you may thing the other side means on the other side of the equal sign. In those cases adding 1/4 to side and subtracting 1/4 from the other side would not be correct.

 

[Steven G]

thanks for your help. May I ask you another problem?

Sure.

 

[lulln]

You added and subtracted 1/4 on one side, not both sides of the equal sign. It is dangerous to say what you said as in other problems you may thing the other side means on the other side of the equal sign. In those cases adding 1/4 to side and subtracting 1/4 from the other side would not be correct.

I found another way

 

[MarkFL]

thanks for your help. May I ask you another problem?

Yes, and I recommend you begin a new thread for a new question.