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Solve -3x² - 4x - 10 = 0

-3x² - 4x - 10 = 0 has no real solutions. The two complex solutions are x = (-2 + √26 i)/3 and x = (-2 - √26 i)/3.

x² +x += 0
−3x2−4x−10=0⇒x=−2+26 i3, −2−26 i3 (complex)-3x^2 - 4x - 10 = 0 \Rightarrow x = \frac{-2 + \sqrt{26}\, i}{3},\ \frac{-2 - \sqrt{26}\, i}{3}\ \text{(complex)}
Discriminant D = -104

Change a, b or c (whole numbers, a not 0) and the exact solutions follow.

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Graph of y = -3x² - 4x - 10-4-3-2-1123-60-50-40-30-20-10vertexy = -3x² - 4x - 10
Graph of y = -3x² - 4x - 10. The curve never reaches the x-axis, which is why there are no real solutions; the vertex is at (-0.66666667, -8.6666667).

How to work it out

  1. 1

    Write it in standard form a x² + b x + c = 0 and read off the coefficients: a = -3, b = -4, c = -10.

    −3x2−4x−10=0-3x^2 - 4x - 10 = 0
  2. 2

    Work out the discriminant D = b² − 4ac. Its sign tells you how many real solutions there are.

    D=(−4)2−4⋅(−3)⋅(−10)=16−120=−104D = (-4)^2 - 4\cdot(-3)\cdot(-10) = 16 - 120 = -104
  3. 3

    D is negative, so there are no real solutions; the two solutions are complex numbers.

  4. 4

    The quadratic formula works for every quadratic:

    x=−b±D2a=4±−104−6x = \frac{-b \pm \sqrt{D}}{2a} = \frac{4 \pm \sqrt{-104}}{-6}
  5. 5

    Simplify (pull the square out of the root) to get the solutions:

    x=−2+26 i3orx=−2−26 i3x = \frac{-2 + \sqrt{26}\, i}{3}\quad\text{or}\quad x = \frac{-2 - \sqrt{26}\, i}{3}
LaTeX source of the formulas on this page
\[ -3x^2 - 4x - 10 = 0\ \Rightarrow\ x = \frac{-2 + \sqrt{26}\, i}{3},\ \frac{-2 - \sqrt{26}\, i}{3} \]
\[ -3x^2 - 4x - 10 = 0 \]
\[ D = (-4)^2 - 4\cdot(-3)\cdot(-10) = 16 - 120 = -104 \]
\[ x = \frac{-b \pm \sqrt{D}}{2a} = \frac{4 \pm \sqrt{-104}}{-6} \]
\[ x = \frac{-2 + \sqrt{26}\, i}{3}\quad\text{or}\quad x = \frac{-2 - \sqrt{26}\, i}{3} \]

The parabola y = -3x² - 4x - 10

xy
-3.6667-35.667267
-2.6667-20.667067
-1.6667-11.666867
-0.6667-8.6666667
0.3333-11.666467
1.3333-20.666267
2.3333-35.666067

Questions

What are the solutions of -3x² - 4x - 10 = 0?

-3x² - 4x - 10 = 0 has no real solutions. The two complex solutions are x = (-2 + √26 i)/3 and x = (-2 - √26 i)/3.

Does -3x² - 4x - 10 = 0 factor?

Not over the integers, because the discriminant -104 is negative. Use the quadratic formula.

What is the vertex of y = -3x² - 4x - 10?

(-2/3, -26/3). The parabola opens downwards, so this is the maximum.

What are the sum and product of the roots?

Sum = −b/a = -4/3, product = c/a = 10/3.

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