roots

**planetdomi** · September 18th 2011, 10:58 AM

How is the following possible.
I realise I may be being very thick about this but I cant see it

4/√2 = 2x2/√2 = 2x√2 x √2/√2 = 2√2

What am I missing

**e^(i*pi)** · September 18th 2011, 11:06 AM

Originally Posted by planetdomi

How is the following possible.
I realise I may be being very thick about this but I cant see it

4/√2 = 2x2/√2 = 2x√2 x √2/√2 = 2√2

What am I missing

You're multiplying your equation by $\dfrac{\sqrt2}{\sqrt2} = 1$ so nothing is changing

**skeeter** · September 18th 2011, 11:09 AM

Originally Posted by planetdomi

How is the following possible.
I realise I may be being very thick about this but I cant see it

4/√2 = 2x2/√2 = 2x√2 x √2/√2 = 2√2

What am I missing

look at it from this point of view ...

$\frac{4}{\sqrt{2}} \cdot \frac{\sqrt{2}}{\sqrt{2}} = \frac{4 \cdot \sqrt{2}}{\sqrt{2} \cdot \sqrt{2}} = \frac{4\sqrt{2}}{2} = \frac{2 \cdot 2\sqrt{2}}{2} = 2\sqrt{2}$

**planetdomi** · September 18th 2011, 11:13 AM

Thankyou so much

Thread: roots

LinkBack

Thread Tools

Display

roots

Re: roots

Re: roots

Re: roots

Similar Math Help Forum Discussions

Roots & Imaginary Roots

Roots

roots

Roots

Given 2 imaginary roots find other 2 roots

Search Tags