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n a certain electrical circuit,an engineer found out that the power P can be expressed by the function P=2x^2-60x+480 where x is the current.
Can the power of the circuit ever be zero?
We can find this out by using the discriminant of this quadratic equation
D =(-60)^2 - 4*2*480
D = 3600 - 3840 = -240, so NO, there are no real roots, cannot equal 0