Question
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Solve by factoring or quadratic formula. \( 3 x^{2}+7 x=-2 \) \( x=\square \) \( * * * \) Use a reduced fraction or round to 3 decimals. List your answers separated by commas, for example: \( \frac{2}{3}, \frac{5}{2} \) type \( 2 / 3,5 / 2 \) Question Help:

Ask by Vaughan Bowman. in the United States
Mar 08,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

\( x = -\frac{1}{3}, -2 \)

Solution

\( 3x^2 + 7x + 2 = 0 \) We factor the quadratic by finding two numbers that multiply to \( 3 \times 2 = 6 \) and add to \( 7 \). The numbers \( 1 \) and \( 6 \) work since \( 1 \times 6 = 6 \) and \( 1 + 6 = 7 \). Rewrite the middle term: \[ 3x^2 + x + 6x + 2 = 0 \] Group the terms: \[ (3x^2 + x) + (6x + 2) = 0 \] Factor each group: \[ x(3x + 1) + 2(3x + 1) = 0 \] Factor out the common binomial: \[ (3x + 1)(x + 2) = 0 \] Set each factor equal to zero: \[ 3x + 1 = 0 \quad \text{or} \quad x + 2 = 0 \] Solve for \( x \): \[ x = -\frac{1}{3} \quad \text{or} \quad x = -2 \] Final answer: \( -1/3, -2 \)

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Mind Expander

First, let's rearrange the equation into standard form: \( 3x^2 + 7x + 2 = 0 \). Now, we need to factor this equation. The coefficients here can be tricky, but we can use the quadratic formula as well. Applying the quadratic formula \( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \), with \( a = 3, b = 7, c = 2 \), we get: \( b^2 - 4ac = 49 - 24 = 25 \) So \( x = \frac{-7 \pm 5}{6} \). This gives us \( x = \frac{-2}{6} = -\frac{1}{3} \) and \( x = \frac{-12}{6} = -2 \). Thus, the answers are: \( -\frac{1}{3}, -2 \) So in the required format: -1 / 3,-2

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