document.write( "Question 432240: A mother's age is 3 years more than the square of her daughter's age. In 18 years time she will be twice her daughter's age. What are the mother's and daughter's ages now?\r
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document.write( "It is a question for applicable Quadratics. I know what the answer is, I just don't know how to solve it.\r
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document.write( "I've tried:
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Algebra.Com's Answer #299757 by scott8148(6628)![]() ![]() You can put this solution on YOUR website! in the 2nd equation, remember that the daughter is also 18 years older ___ m + 18 = 2(d + 18)\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "m = 2d + 18\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "substituting ___ 2d + 18 = d^2 + 3\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "0 = d^2 - 2d - 15\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "factoring ___ 0 = (d - 5)(d + 3)\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "d + 3 = 0 ___ d = -3 ___ negative value not realistic\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "d - 5 = 0 ___ d = 5\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |