document.write( "Question 289987: The Function P=3i^2-2i+450 models the power P in an electric circuit with a current i. Can the power in this circuit ever be zero? If so what is the value of i \n" ); document.write( "

Algebra.Com's Answer #209920 by Fombitz(32388) $\"\"$ $\"About$

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$\"P=3i%5E2-2i%2B450+=0\"$
\n" ); document.write( "You can use the discriminant to find the number of real roots (when D>0).
\n" ); document.write( " $\"+D=b%5E2-4ac+\"$
\n" ); document.write( " $\"a=3\"$
\n" ); document.write( " $\"b=-2\"$
\n" ); document.write( " $\"c=450\"$
\n" ); document.write( " $\"+D=%28-2%29%5E2-4%283%29%28450%29=-5396\"$
\n" ); document.write( "Since D<0, there are no real roots, that is, no value of i which make P=0.
\n" ); document.write( " \n" ); document.write( "

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