Solve the equation $2(x+1)^2 - (x-2)^2 = x(x-3)$ for $x$.

AlgebraQuadratic EquationsEquation SolvingAlgebraic Manipulation
2025/6/25

1. Problem Description

Solve the equation 2(x+1)2(x2)2=x(x3)2(x+1)^2 - (x-2)^2 = x(x-3) for xx.

2. Solution Steps

First, expand the squared terms using the formula (a+b)2=a2+2ab+b2(a+b)^2 = a^2 + 2ab + b^2:
(x+1)2=x2+2x+1(x+1)^2 = x^2 + 2x + 1
(x2)2=x24x+4(x-2)^2 = x^2 - 4x + 4
Now substitute these expressions back into the original equation:
2(x2+2x+1)(x24x+4)=x(x3)2(x^2 + 2x + 1) - (x^2 - 4x + 4) = x(x-3)
Expand the equation:
2x2+4x+2x2+4x4=x23x2x^2 + 4x + 2 - x^2 + 4x - 4 = x^2 - 3x
Combine like terms on the left side:
x2+8x2=x23xx^2 + 8x - 2 = x^2 - 3x
Subtract x2x^2 from both sides:
8x2=3x8x - 2 = -3x
Add 3x3x to both sides:
11x2=011x - 2 = 0
Add 22 to both sides:
11x=211x = 2
Divide both sides by 1111:
x=211x = \frac{2}{11}

3. Final Answer

x=211x = \frac{2}{11}

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