Answer :

Alright, let's solve the equation [tex]\(5 - 3x^3 = 86\)[/tex] step-by-step.

1. Start with the given equation:
[tex]\[ 5 - 3x^3 = 86 \][/tex]

2. Isolate the term involving [tex]\(x\)[/tex]:
[tex]\[ -3x^3 = 86 - 5 \][/tex]
Simplify the right-hand side:
[tex]\[ -3x^3 = 81 \][/tex]

3. Divide both sides by -3:
[tex]\[ x^3 = \frac{81}{-3} \][/tex]
Simplify the division:
[tex]\[ x^3 = -27 \][/tex]

4. Take the cube root of both sides to solve for [tex]\(x\)[/tex]:
To solve [tex]\(x^3 = -27\)[/tex], we take the cube root of both sides. Note that the cube root of [tex]\(-27\)[/tex] has three complex roots.

The three roots are:
[tex]\[ x = -3, \quad x = \frac{3}{2} - \frac{3\sqrt{3}i}{2}, \quad x = \frac{3}{2} + \frac{3\sqrt{3}i}{2} \][/tex]

So, the solutions to the equation [tex]\(5 - 3x^3 = 86\)[/tex] are:
[tex]\[ x = -3, \quad x = \frac{3}{2} - \frac{3\sqrt{3}i}{2}, \quad x = \frac{3}{2} + \frac{3\sqrt{3}i}{2} \][/tex]

These are the values of [tex]\(x\)[/tex] that satisfy the given equation.