Book Maths Puzzle Quadratic Equations

In a quadratic word problem there are two roots. I know that the one you do not need begins with an E, but what is its exact name of the word

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Book Other Question

In a plane, the locus of points 3 cm from a given G, describe each locus of points completely The number of bacteria in a certain is given by B(t)= 25000e2t where t= 0 corresponds to noon.
a. Find the number of bacteria present at 2p.m.
b. When will the population dou