- #51

- 213

- 4

a^4-2a^2b^2+b^4 =4a^2b^2 ==> (a^2-b^2)^2 = 4a^2b^2How did you come up with that equation?

What is 0 + 4a^{2}b^{2}?

That's what you should have on the right hand side. The left hand side should be a^{4}-2a^{2}b^{2}-b^{4}. Right?

taking root of both sides ==> a^2-b^2 = 2ab