Question
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What are the solutions to the equation \( (x-1)(x+2)=-2 \) ? \[ \begin{array}{l}x=-3, x=0 \\ x=-1, x=3 \\ x=-2, x=1 \\ x=0\end{array} \]

Ask by Ellis Chadwick. in the United States
Jan 23,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The solutions are \( x = -1 \) and \( x = 0 \).

Solution

Solve the quadratic equation by following steps: - step0: Solve by factoring: \(\left(x-1\right)\left(x+2\right)+2=0\) - step1: Expand the expression: \(x^{2}+x=0\) - step2: Factor the expression: \(x\left(x+1\right)=0\) - step3: Separate into possible cases: \(\begin{align}&x=0\\&x+1=0\end{align}\) - step4: Solve the equation: \(\begin{align}&x=0\\&x=-1\end{align}\) - step5: Rewrite: \(x_{1}=-1,x_{2}=0\) To solve the equation \( (x-1)(x+2) = -2 \), we first rearrange it to standard form: \[ (x-1)(x+2) + 2 = 0 \] Now, we can expand the left side: \[ x^2 + 2x - x - 2 + 2 = 0 \] This simplifies to: \[ x^2 + x = 0 \] Next, we can factor this equation: \[ x(x + 1) = 0 \] Setting each factor to zero gives us the solutions: 1. \( x = 0 \) 2. \( x + 1 = 0 \) which leads to \( x = -1 \) Thus, the solutions to the equation \( (x-1)(x+2) = -2 \) are: \[ x = -1 \quad \text{and} \quad x = 0 \] From the provided options, the correct pair of solutions is \( x = -1, x = 0 \).

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The Deep Dive

To solve the equation \( (x-1)(x+2) = -2 \), we first expand the left side: \[ (x-1)(x+2) = x^2 + 2x - x - 2 = x^2 + x - 2. \] Now we set the equation to equal zero by moving \(-2\) to the left side: \[ x^2 + x - 2 + 2 = 0 \implies x^2 + x = 0. \] Factoring out \(x\): \[ x(x + 1) = 0. \] This gives the solutions \(x = 0\) or \(x = -1\). So, the correct answer is \(x = -1, x = 0\). Now, if we check each option listed: 1. \(x = -3, x = 0\) - Not valid, as \(-3\) doesn't satisfy the equation. 2. \(x = -1, x = 3\) - Valid for \(-1\), but not for \(3\). 3. \(x = -2, x = 1\) - Not valid, neither satisfies the equation. 4. \(x = 0\) - Valid, but incomplete without \(-1\). So the solution is indeed \(x = -1\) and \(x = 0\).

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