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Apr23-10, 01:44 AM
Converting square root to perfect square
no its in an equation form,
C(x) = [(9-x) + 1.25sqrt( x^2 + 36 )], where C(x) is a function.
and they're trying to solve for x, so they used the method above, and I know how to solve it, but I lost it when they used let x = 3( t - 1/t )
x = 3( t - 1/t ) ⇒ x
= 9( t - 1/t )
), how does that turn into an expression like √(a+b)
I do not think there rule per se for using that substitution though.