document.write( "Question 94574This question is from textbook College Algebra
\n" ); document.write( ": I am 32 and just now going back to college, so it has been um..oh about 15 years since I even did any type of algebra problem. This is all new territory for me. Here is the problem as it was presented to me. \r
\n" ); document.write( "\n" ); document.write( "Find k such that the equation x(2)^-kx+4=0 has a repeated real solution. \r
\n" ); document.write( "\n" ); document.write( "I am not understanding the concept of real solution, I think.\r
\n" ); document.write( "\n" ); document.write( "Erica \n" ); document.write( "

Algebra.Com's Answer #68903 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
Find k such that the equation x(2)^-kx+4=0 has a repeated real solution.
\n" ); document.write( "The discriminant tells you.
\n" ); document.write( "If b^2-4ac = 0 there will be two equal Real Number solutions.
\n" ); document.write( "Your Problem:
\n" ); document.write( "a=1,b=-k,c=4
\n" ); document.write( "b^2-4ac = (-k)^2-4*1*4 =k^2-16
\n" ); document.write( "k^2-16 0
\n" ); document.write( "(k-4)(k+4) >0
\n" ); document.write( "True when k=4 and when k=-4
\n" ); document.write( "Conclusion: You will have two equal Real Number solutions when
\n" ); document.write( "k=4 and when k=-4.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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