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Murex trunculus

Murex trunculus is a shellfish, source of the royal Tyrian purple. The shell of this gastropod is very rough, adorned with spines. It prefers the warm seas.



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Quadratic formula

... on x) to the expression to the left of "=", that will make it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = ...

 
 
 
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