square root problem

[marsh adder]

Why B = sqrt(3)-1 but C doesn’t equal to sqrt(3)-2 ?
Please help

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[craggy ledge]

sqrt(x^2) is |x|
sqrt(3) - 2 is negative

[marsh adder]

But ^2 doesn’t cancel the sqrt ?

[craggy ledge]

it puts an absolute value

[marsh adder]

Why ?

[craggy ledge]

ok what's sqrt((-5)^2)

[marsh adder]

Sqrt 25

so 5

[craggy ledge]

as you can see it gets the absolute value

[marsh adder]

Yeah but I tried to develop C

i obtain sqrt (4-2sqrt3 )

But I didn’t found sqrt(3)-2

[craggy ledge]

i dont think thats right

[marsh adder]

Ok i send you sth

wait

and thx very much for your help

[craggy ledge]

anyway developing the inside is a waste of time

just take the absolute value

[marsh adder]

Yeah but I like to demonstrate to understand why

[craggy ledge]

this demonstrates why

[marsh adder]

+close