If the ordered triple (a, b, c) of integers are the coefficients for . Find the minimum of If
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When we look at x = 3 2 + 3 + 3 2 − 3 , we don't like the cube roots sitting there. That gives us the idea to cube both sides.
Cubing, we get:
x 3 = 2 + 3 + 2 − 3 + 3 ( 3 ( 2 + 3 ) 2 ( 2 − 3 ) + 3 ( 2 + 3 ) ( 2 − 3 ) 2 )
When we look at those ugly radicals, we see difference of squares: ( 2 + 3 ) ( 2 − 3 ) = 1 which means those ugly radicals become:
3 ( 3 2 + 3 + 3 2 − 3 )
But we already know x = 3 2 + 3 + 3 2 − 3 so the equation becomes: x 3 = 4 + 3 x
Putting into standard form and finding the absolute value of the sum of the coefficients, we get 7