Answer :

To solve the quadratic equation [tex]\(6 + 3x^2 = 18\)[/tex], follow these steps:

1. Isolate the quadratic term:
To start, we need to move all terms to one side so that we can set the equation to zero. First, subtract 18 from both sides of the equation:
[tex]\[ 6 + 3x^2 - 18 = 0 \][/tex]

2. Simplify the equation:
Combine like terms on the left side:
[tex]\[ 3x^2 - 12 = 0 \][/tex]

3. Factor out the common factor:
We notice that both terms on the left side can be divided by the common factor of 3:
[tex]\[ x^2 - 4 = 0 \][/tex]

4. Solve for [tex]\(x\)[/tex]:
This equation is a difference of squares, which can be factored further:
[tex]\[ (x - 2)(x + 2) = 0 \][/tex]
Set each factor equal to zero:
[tex]\[ x - 2 = 0 \quad \text{or} \quad x + 2 = 0 \][/tex]

Solving these two equations gives us the solutions:
[tex]\[ x = 2 \quad \text{or} \quad x = -2 \][/tex]

Therefore, the solutions to the quadratic equation [tex]\(6 + 3x^2 = 18\)[/tex] are:
[tex]\[ x = 2 \quad \text{and} \quad x = -2 \][/tex]