# What are the algebraic steps to transform this expression? (Part of differential calculus) [closed]

sorry if this seems to be too easy for you, but I have struggled a lot with this expression and I don't get it how they got there:

How can $$\sqrt{2x^2}$$ become $$4x^2$$ ?

• Mathoverflow is for research level math questions. Try math.stackexchange. – JoshuaZ Sep 25 '19 at 15:53
• ah I see, ok. I will post on the other platform from now on. – artgrohe Sep 26 '19 at 8:25
• you can delete this answer if you want, since it's off-topic. I cannot delete it.. – artgrohe Sep 26 '19 at 8:53

You need to multiply the numerator and the denominator by $$2 \sqrt{2x^2}$$ to obtain the second equation from the first.