:)) It's too easy to me to find out the mistake here. 1. at the line 2: don't multiply 2 side of an equation by a number when you're not sure if it equals 0. 2. Consider a=b(both of them are nor equal 0) (a+b)(a-b)=b(a-b) (a-b)(a+b-b)=0 (a-b)a=0 a=b (right) or a=0 (wrong 'cause a not equals 0)
Oh, it's nothing special here. a = b --> a - b = 0 So you can't divide both of sides by (a-b). The problem here is step 5. Rest of the math is non sense!
3 Comments:
:)) It's too easy to me to find out the mistake here.
1. at the line 2: don't multiply 2 side of an equation by a number when you're not sure if it equals 0.
2. Consider a=b(both of them are nor equal 0)
(a+b)(a-b)=b(a-b)
(a-b)(a+b-b)=0
(a-b)a=0
a=b (right)
or a=0 (wrong 'cause a not equals 0)
Ok? :D
Sorry! There are some mistakes in my comments:
1. It's too easy "for" me.....
2. both of them "not" equal 0
Oh, it's nothing special here.
a = b --> a - b = 0
So you can't divide both of sides by (a-b).
The problem here is step 5.
Rest of the math is non sense!
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