Question
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:
\( -1/3, -2 \)
Answered by UpStudy AI and reviewed by a Professional Tutor
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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