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surds problem
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surds problem
Admin Mon Feb 21, 2011 7:33 pm
Given the area of the rectangle is 6 cm^2 find the exact value of L in its simplest form.
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Admin- Admin
- Posts : 62
Points : 71
Join date : 2010-10-02 -
Re: surds problem
Thimodya/Waspinator Wed Feb 23, 2011 6:08 am
is it L= 4.87
because the square root of 2 is 1.41
1.41 times 3 is 4.23 - 3 is 1.23
6 divided by 1.23 is 4.88
i know it barely has anythin yo do with surds but i got confused and decided to do it the non-surds way...........
because the square root of 2 is 1.41
1.41 times 3 is 4.23 - 3 is 1.23
6 divided by 1.23 is 4.88
i know it barely has anythin yo do with surds but i got confused and decided to do it the non-surds way...........
Thimodya/Waspinator- Posts : 10
Points : 10
Join date : 2010-10-03
Re: surds problem
Jihye Choi Sat Feb 26, 2011 10:53 am
I think it's 2√2 +2 (cm)
because 6cm² = (3√2 -3) × L
so L = 6 ÷ (3√2 -3)
6 /(3√2 -3) = 6(3√2 +3) /(3√2 -3)(3√2 +3)
= (18√2 +18) /18 -9 = (18√2 +18) /9 = 2√2 +2
∴ L = 2√2 +2 (cm)
because 6cm² = (3√2 -3) × L
so L = 6 ÷ (3√2 -3)
6 /(3√2 -3) = 6(3√2 +3) /(3√2 -3)(3√2 +3)
= (18√2 +18) /18 -9 = (18√2 +18) /9 = 2√2 +2
∴ L = 2√2 +2 (cm)
Jihye Choi- Posts : 2
Points : 2
Join date : 2010-10-11
Re: surds problem
fergus Sun Feb 27, 2011 7:02 am
I cant do this by using surds o.O
So i think timmy is right
So i think timmy is right
fergus- Posts : 18
Points : 29
Join date : 2010-10-03
Age : 113 -
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