## viniterranova 3 years ago 1) a=b 2) ab=a^2 3) ab-b^2=a^2-b^2 4) b(a-b)=(a+b)(a-b) 5) b= a+b Reminder the first step where b = 2b So, 1=2. In this case in my opinion the wrong step is that in the third, because you can´t subtract -b^2 from both sides.

1. ParthKohli

lol why not?

2. ParthKohli

Transition from step 4-5 is wrong. Guess why!

3. viniterranova

Tell me ParthKohli.

4. ParthKohli

Division by zero. Period.

5. viniterranova

Write step-by-step. plz.

6. ParthKohli

$\rm b(a - b) = (a + b)(a - b)$Since (a - b) = 0,$\rm 0b = 0(a + b)$

7. ParthKohli

But what this thing shows is that it's divided both sides by 0.

8. viniterranova

thanks