document.write( "Question 1052703: I need help finding the polynomial with the given zeros of 0, 8, and 1+sqrt2i with real coefficients please! I've tried and so far all I've gotten is x^2-8x-x+sqrt2i+8+sqrt2i\r
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document.write( "Any help is appreciated, thanks!
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Algebra.Com's Answer #668038 by Boreal(15235) You can put this solution on YOUR website! with zeros of 0 and 8, the factors are x and (x-8) \n" ); document.write( "1+/-sqrt2i needs to be found. \n" ); document.write( "[-b +/- sqrt (b^2-4ac)](1/2) needs to be evaluated \n" ); document.write( "if a is 1 and b is -2, x=(1/2)(2 +/- sqrt (4-4(1)(c)) \n" ); document.write( "This gives me 1 +/- sqrt (4-4c), and that has to become negative 16, because then it will be 4i, and it is divided by 2 in the formula, and that will be 2i. \n" ); document.write( "c has to be 5, then sqrt (4-4c)=sqrt(-16) \n" ); document.write( "The third factor is (x^2-2x+5), and x=(1/2)+/- (2 +/- sqrt (4-20)) \n" ); document.write( "=(1/2)(2+/-4i)=1+/-2i\r \n" ); document.write( "\n" ); document.write( "The polynomial is x(x-8)(x^2-2x+5)=x^4-10x^3+21x^2-40x. \n" ); document.write( " |