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Solve x² - 10x + 2 = 0

The solutions of x² - 10x + 2 = 0 are x = 5 + √23 or x = 5 - √23, that is x ≈ 9.7958315 and x ≈ 0.20416848.

x² +x += 0
x2−10x+2=0⇒x=5+23, 5−23x^2 - 10x + 2 = 0 \Rightarrow x = 5 + \sqrt{23},\ 5 - \sqrt{23}
Discriminant D = 92 · x ≈ 9.79583, 0.204168

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

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Graph of y = x² - 10x + 2-224681012-30-20-10102030x = 9.7958315x = 0.20416848vertexy = x² - 10x + 2
Graph of y = x² - 10x + 2. The curve crosses the x-axis at x = 9.7958315 and x = 0.20416848; the vertex is at (5, -23).

How to work it out

  1. 1

    Write it in standard form a x² + b x + c = 0 and read off the coefficients: a = 1, b = -10, c = 2.

    x2−10x+2=0x^2 - 10x + 2 = 0
  2. 2

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

    D=(−10)2−4⋅1⋅2=100−8=92D = (-10)^2 - 4\cdot1\cdot2 = 100 - 8 = 92
  3. 3

    D is positive, so there are two different real solutions.

  4. 4

    The quadratic formula works for every quadratic:

    x=−b±D2a=10±922x = \frac{-b \pm \sqrt{D}}{2a} = \frac{10 \pm \sqrt{92}}{2}
  5. 5

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

    x=5+23orx=5−23x = 5 + \sqrt{23}\quad\text{or}\quad x = 5 - \sqrt{23}
  6. 6

    As decimals: x ≈ 9.7958315 and x ≈ 0.20416848.

  7. 7

    Check numerically: for x ≈ 9.7958315 the left side is -1.4210855e-14 (zero up to rounding) ✓

LaTeX source of the formulas on this page
\[ x^2 - 10x + 2 = 0\ \Rightarrow\ x = 5 + \sqrt{23},\ 5 - \sqrt{23} \]
\[ x^2 - 10x + 2 = 0 \]
\[ D = (-10)^2 - 4\cdot1\cdot2 = 100 - 8 = 92 \]
\[ x = \frac{-b \pm \sqrt{D}}{2a} = \frac{10 \pm \sqrt{92}}{2} \]
\[ x = 5 + \sqrt{23}\quad\text{or}\quad x = 5 - \sqrt{23} \]

The parabola y = x² - 10x + 2

xy
2-14
3-19
4-22
5-23
6-22
7-19
8-14

Questions

What are the solutions of x² - 10x + 2 = 0?

The solutions of x² - 10x + 2 = 0 are x = 5 + √23 or x = 5 - √23, that is x ≈ 9.7958315 and x ≈ 0.20416848.

Does x² - 10x + 2 = 0 factor?

Not over the integers, because the discriminant 92 is not a perfect square. Use the quadratic formula.

What is the vertex of y = x² - 10x + 2?

(5, -23). The parabola opens upwards, so this is the minimum.

What are the sum and product of the roots?

Sum = −b/a = 10, product = c/a = 2.

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    Solve x² - 10x + 2 = 0: x = 5 + √23 or x = 5 - √23 (steps) | WordGPT