document.write( "Question 267263: A polynomial in x has degree 3. The coefficient of x^2 is 3 less than the coefficient of x^3. The coefficient of x is three times the coefficient of x^2. The remaining coefficient is 2 more than the coefficient of x^3. The sum of the coefficients is -4. Find the polynomial. \n" ); document.write( "
Algebra.Com's Answer #196282 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! We will try to get every variable in terms of a \n" ); document.write( ": \n" ); document.write( "A polynomial in x has degree 3. \n" ); document.write( "ax^3 + bx^2 + cx + d \n" ); document.write( ": \n" ); document.write( "The coefficient of x^2 is 3 less than the coefficient of x^3. \n" ); document.write( "b = a - 3 \n" ); document.write( ": \n" ); document.write( "The coefficient of x is three times the coefficient of x^2. \n" ); document.write( "c = 3b \n" ); document.write( "Replace b with (a-3) \n" ); document.write( "c = 3(a-3) \n" ); document.write( "c = 3a - 9 \n" ); document.write( ": \n" ); document.write( "The remaining coefficient is 2 more than the coefficient of x^3. \n" ); document.write( "d = a + 2 \n" ); document.write( ": \n" ); document.write( "The sum of the coefficients is -4. Find the polynomial. \n" ); document.write( "a + b + c + d = -4 \n" ); document.write( "Substitute, solve for a \n" ); document.write( "a + (a-3) + (3a-9) + (a+2) = -4 \n" ); document.write( "6a - 10 = -4 \n" ); document.write( "6a = -4 + 10 \n" ); document.write( "6a = 6 \n" ); document.write( "a = 1 \n" ); document.write( "then \n" ); document.write( "b = 1 - 3 \n" ); document.write( "b = -2 \n" ); document.write( "and \n" ); document.write( "c = 3(1) - 9 \n" ); document.write( "c = -6 \n" ); document.write( ": \n" ); document.write( "d = 1 + 2 \n" ); document.write( "d = 3 \n" ); document.write( ": \n" ); document.write( "x^3 - 2x^2 - 6x + 3; is the polynomial \n" ); document.write( " \n" ); document.write( " |