Solve the Cubic Equation: x³ = x² + 2x Step-by-Step

x3=x2+2x x^3=x^2+2x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:03 Arrange the equation so that the right side equals 0
00:11 Factor into terms with X squared
00:24 Take out the common factor from the parentheses
00:33 We want to find which solution zeros each factor in the multiplication
00:36 This is one solution
00:39 Now let's find the second solution
00:42 Factor using trinomial method, looking at the coefficients
00:45 We want to find 2 numbers whose sum equals B (-1)
00:51 And their product equals C (-2)
00:56 These are the appropriate numbers, let's substitute in the multiplication
01:03 We want to find which solution zeros each factor in the multiplication
01:16 And this is the solution to the problem

Step-by-step written solution

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1

Understand the problem

x3=x2+2x x^3=x^2+2x

2

Step-by-step solution

To solve the problem x3=x2+2x x^3 = x^2 + 2x , follow these steps:

  • Step 1: Re-arrange the equation to have all terms on one side:
    x3x22x=0 x^3 - x^2 - 2x = 0 .
  • Step 2: Factor out the greatest common factor (GCF), which is x x :
    x(x2x2)=0 x(x^2 - x - 2) = 0 .
  • Step 3: Factor the quadratic expression x2x2 x^2 - x - 2 :
    The factors of 2-2 that add up to 1-1 are 2-2 and 11. Thus, x2x2=(x2)(x+1) x^2 - x - 2 = (x-2)(x+1) .
  • Step 4: Combine the factored terms:
    x(x2)(x+1)=0 x(x-2)(x+1) = 0 .

Each factor can be set to zero to find the solutions:

  • x=0 x = 0 .
  • x2=0 x - 2 = 0 , so x=2 x = 2 .
  • x+1=0 x + 1 = 0 , so x=1 x = -1 .

The solutions to the equation are x=0,1,2 x = 0, -1, 2 .

Therefore, the correct choice from the given options is:
x=0,1,2 x = 0, -1, 2 .

3

Final Answer

x=0,1,2 x=0,-1,2

Practice Quiz

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Break down the expression into basic terms:

\( 4x^2 + 6x \)

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