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Solve -3x² + 4x - 4 = 0

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

x² +x += 0
−3x2+4x−4=0⇒x=2+22 i3, 2−22 i3 (complex)-3x^2 + 4x - 4 = 0 \Rightarrow x = \frac{2 + 2\sqrt{2}\, i}{3},\ \frac{2 - 2\sqrt{2}\, i}{3}\ \text{(complex)}
Discriminant D = -32

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

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Graph of y = -3x² + 4x - 4-3-2-11234-50-40-30-20-10vertexy = -3x² + 4x - 4
Graph of y = -3x² + 4x - 4. The curve never reaches the x-axis, which is why there are no real solutions; the vertex is at (0.66666667, -2.6666667).

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 = -4.

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

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

    D=42−4⋅(−3)⋅(−4)=16−48=−32D = 4^2 - 4\cdot(-3)\cdot(-4) = 16 - 48 = -32
  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±−32−6x = \frac{-b \pm \sqrt{D}}{2a} = \frac{-4 \pm \sqrt{-32}}{-6}
  5. 5

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

    x=2+22 i3orx=2−22 i3x = \frac{2 + 2\sqrt{2}\, i}{3}\quad\text{or}\quad x = \frac{2 - 2\sqrt{2}\, i}{3}
LaTeX source of the formulas on this page
\[ -3x^2 + 4x - 4 = 0\ \Rightarrow\ x = \frac{2 + 2\sqrt{2}\, i}{3},\ \frac{2 - 2\sqrt{2}\, i}{3} \]
\[ -3x^2 + 4x - 4 = 0 \]
\[ D = 4^2 - 4\cdot(-3)\cdot(-4) = 16 - 48 = -32 \]
\[ x = \frac{-b \pm \sqrt{D}}{2a} = \frac{-4 \pm \sqrt{-32}}{-6} \]
\[ x = \frac{2 + 2\sqrt{2}\, i}{3}\quad\text{or}\quad x = \frac{2 - 2\sqrt{2}\, i}{3} \]

The parabola y = -3x² + 4x - 4

xy
-2.3333-29.666067
-1.3333-14.666267
-0.3333-5.6664667
0.6667-2.6666667
1.6667-5.6668667
2.6667-14.667067
3.6667-29.667267

Questions

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

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

Does -3x² + 4x - 4 = 0 factor?

Not over the integers, because the discriminant -32 is negative. Use the quadratic formula.

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

(2/3, -8/3). 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 = 4/3.

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