area

**andyboy179** · January 15th 2010, 07:11 AM

hi, my question is to find the area of this rectangle, im not sure how to work it out so could anyone help?

i think the answer would be 2?

$area-maths.jpg$

**skeeter** · January 15th 2010, 07:34 AM

Originally Posted by andyboy179

hi, my question is to find the area of this rectangle, im not sure how to work it out so could anyone help?

i think the answer would be 2?

$Click image for larger version. Name: maths.jpg Views: 8 Size: 12.5 KB ID: 14829$

$(a+b)(c-d) = ac - ad + bc - bd$

$(1+\sqrt{3})(2-\sqrt{3}) = 2 - \sqrt{3} + 2\sqrt{3} - 3 = \sqrt{3} - 1$

**andyboy179** · January 15th 2010, 07:38 AM

could you explain how you got that please?

**skeeter** · January 15th 2010, 07:56 AM

Originally Posted by andyboy179

could you explain how you got that please?

I thought I did ...

**andyboy179** · January 15th 2010, 07:59 AM

well i don't understand how you got that, how did (1+root3)(-2root3) end up as 2- root3 + 2 root3-3

**skeeter** · January 15th 2010, 08:02 AM

Originally Posted by andyboy179

well i don't understand how you got that, how did (1+root3)(-2root3) end up as 2- root3 + 2 root3-3

read a lesson and find out how ...

Adding (and Subtracting) Square Roots

**andyboy179** · January 15th 2010, 08:05 AM

don't worry i will try and find out at school

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