Polynomials with xDate: 9/10/96 at 17:2:23 From: Joe Subject: Polynomials With x Can you help me figure out problems like 3x-x(3-5x)=(5x-2)(x+4) ? Thanks. Date: 9/12/96 at 12:34:43 From: Doctor Leigh Subject: Re: Polynomials With x Thank you for your question!!! 3x-x(3-5x)=(5x-2)(x+4) First distribute 3x-3x+5x^2 = 5x^2-2x+20x-8 Then combine like terms 5x^2 = 5x^2+18x-8 Move all the x's to one side -5x^2 -5x^2 0 = 18x-8 Add 8 to both sides 8 = 18x Divide by 18 8/18 = x The steps for problems like this are: 1. follow your order of operations - do each operation indicated (multiplication, etc.) 2. combine like terms 3. get all of the x's over to one side 4. solve for x You try the rest! -Doctor Leigh Ann, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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