Solve): x ^ 3 - 8x ^ 2 + 19x - 12 = 0

0

 To solve the equation

𝑥38𝑥2+19𝑥12=0, we can use different methods such as factoring, synthetic division, or the cubic formula. Let's use the Rational Root Theorem combined with synthetic division to find the roots.

  1. List all possible rational roots using the Rational Root Theorem: ±(factors of constant term) / (factors of leading coefficient) Possible roots: ±1, ±2, ±3, ±4, ±6, ±12

  2. Try synthetic division with each possible root until we find one that yields a remainder of zero.

Let's start with the possible roots:

  1. 𝑥=1

    1. Synthetic division:

      lua
      1 | 1 -8 19 -12 | 1 -7 12 |----------------- 1 -7 12 0

    Since the remainder is zero, 𝑥=1 is a root.

    Now we have factored our polynomial as: (𝑥1)(𝑥27𝑥+12)=0

    Next, solve 𝑥27𝑥+12=0 using either factoring or the quadratic formula.

    𝑥27𝑥+12=0

  2. So the roots of the equation 𝑥38𝑥2+19𝑥12=0 are 𝑥=1,𝑥=3, and 𝑥=4.

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