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What are the roots of the equation? \[ 3 x^{2}-5 x+12=0 \] Answer \( \begin{array}{l}\frac{4}{3} \text { and }-3 \\ \frac{5 \pm i \sqrt{119}}{6} \\ 3 \text { and }-\frac{4}{3}\end{array} \quad \begin{array}{l}\text { Submit } \\ \text { Answer }\end{array} \) 4

Ask by Hill Nunez. in the United States
Mar 10,2025

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Answer

The roots of the equation \( 3x^{2} - 5x + 12 = 0 \) are \( \frac{5 \pm i\sqrt{119}}{6} \).

Solution

1. Write the quadratic equation in standard form: \[ 3x^2 - 5x + 12 = 0 \] 2. Recall the quadratic formula for an equation of the form \( ax^2 + bx + c = 0 \): \[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \] 3. Identify the coefficients: \[ a = 3, \quad b = -5, \quad c = 12 \] 4. Compute the discriminant: \[ \Delta = b^2 - 4ac = (-5)^2 - 4(3)(12) = 25 - 144 = -119 \] 5. Since the discriminant is negative, the roots are complex. Substitute back into the quadratic formula: \[ x = \frac{-(-5) \pm \sqrt{-119}}{2 \cdot 3} = \frac{5 \pm i\sqrt{119}}{6} \] Thus, the roots of the equation are: \[ \frac{5 \pm i\sqrt{119}}{6} \]

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To solve the quadratic equation \( 3 x^{2}-5 x+12=0 \), we can apply the quadratic formula \( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \). Here, \( a = 3 \), \( b = -5 \), and \( c = 12 \). Plugging these values in, we find \( b^2 - 4ac = (-5)^2 - 4(3)(12) = 25 - 144 = -119 \). Since the discriminant is negative, the roots will involve complex numbers: \( x = \frac{5 \pm i \sqrt{119}}{6} \). When dealing with complex roots, it's essential to understand the implications for graphing. The parabola represented by the equation will not intersect the x-axis. Instead, it resides entirely above or below the axis, and in this case, it opens upwards since the coefficient of \( x^2 \) (which is 3) is positive. This can be a fun opportunity to visualize the equation, as you won't find any real solutions, only fascinating complex pairs!

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