document.write( "Question 1099067: Find a polynomial with integer coefficients that satisfies the given conditions.
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document.write( "Q has degree 3 and zeros −4 and 1 + i\r
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document.write( "I do not know how to do this could you please help me.
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Algebra.Com's Answer #713466 by Boreal(15235)![]() ![]() You can put this solution on YOUR website! the other zero is 1-i,since they are conjugate. \n" ); document.write( "one factor is (x+4) \n" ); document.write( "Using the quadratic formula, one wants to end up with [2+/- sqrt (-4)]/2, because that will reduce to 1+/-i\r \n" ); document.write( "\n" ); document.write( "Therefore, using the quadratic formula, b=-2 and (b^2-4ac) must be -4, because the square root of -4 is +/-2i, and 2i/2=1, assuming a=1, which is the easiest case for Ax^2+Bx+C \n" ); document.write( "That would be 4-4ac=-4 and a=1 \n" ); document.write( "so 4-4c=-4 \n" ); document.write( "-4c=-8 \n" ); document.write( "c=2 \n" ); document.write( "the quadratic factor is x^2-2x+2 \n" ); document.write( "The polynomial is the product of the two factors \n" ); document.write( "x^3+4x^2-2x^2-8x+2x+8 \n" ); document.write( "x^3+2x^2-6x+8 \n" ); document.write( " |