Identify the first invalid step in the following proof.

- \(|x| = \underbrace{1 + 1 + 1 + ..... + 1}_{|x| \, \text{ times}} \)
- \(|x| \times |x| = \underbrace{|x + x + x + ..... + x|}_{|x| \, \text{ times}} \)
- \(x^2 = \underbrace{|x + x + x + ..... + x|}_{|x| \, \text{ times}} \)
- \(\dfrac{d}{dx}(x^2) = \dfrac{d}{dx}(\underbrace{|x + x + x + ..... + x|}_{|x| \, \text{ times}}) \)
- \(2x = \underbrace{1 + 1 + ..... + 1}_{|x| \, \text{ times}} \)
- \(2x = x \)
- \(2 = 1 \)

×

Problem Loading...

Note Loading...

Set Loading...