Which of the following is a solution of [tex]$3x^2 = 7x - 3?$[/tex]

A. [tex]x = 1[/tex]
B. [tex]x = -1[/tex]
C. [tex]x = 3[/tex]
D. [tex]x = -3[/tex]



Answer :

Sure, let's solve the equation [tex]\(3x^2 = 7x - 3\)[/tex] step by step to find the solutions.

1. Rewrite the Equation:
First, we'll start by rewriting the given quadratic equation in standard form:
[tex]\[ 3x^2 - 7x + 3 = 0 \][/tex]

2. Identify the Coefficients:
A quadratic equation in standard form is [tex]\( ax^2 + bx + c = 0 \)[/tex]. In this case:
[tex]\[ a = 3, \quad b = -7, \quad c = 3 \][/tex]

3. Apply the Quadratic Formula:
The quadratic formula is given by:
[tex]\[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \][/tex]
Plug in the identified coefficients [tex]\(a\)[/tex], [tex]\(b\)[/tex], and [tex]\(c\)[/tex]:
[tex]\[ x = \frac{-(-7) \pm \sqrt{(-7)^2 - 4 \cdot 3 \cdot 3}}{2 \cdot 3} \][/tex]

4. Simplify Inside the Square Root:
Calculate the discriminant ([tex]\(\Delta\)[/tex]):
[tex]\[ \Delta = b^2 - 4ac = (-7)^2 - 4 \cdot 3 \cdot 3 = 49 - 36 = 13 \][/tex]

5. Complete the Formula:
Substitute the discriminant ([tex]\(\sqrt{13}\)[/tex]) back into the formula:
[tex]\[ x = \frac{7 \pm \sqrt{13}}{6} \][/tex]

6. Separate the Solutions:
The solutions are:
[tex]\[ x = \frac{7 + \sqrt{13}}{6} \quad \text{and} \quad x = \frac{7 - \sqrt{13}}{6} \][/tex]

Thus, the two solutions to the equation [tex]\(3x^2 = 7x - 3\)[/tex] are:
[tex]\[ x = \frac{7}{6} + \frac{\sqrt{13}}{6} \quad \text{and} \quad x = \frac{7}{6} - \frac{\sqrt{13}}{6} \][/tex]

To summarize, the solutions to the quadratic equation [tex]\(3x^2 = 7x - 3\)[/tex] are:
[tex]\[ \left[\frac{7}{6} - \frac{\sqrt{13}}{6}, \frac{7}{6} + \frac{\sqrt{13}}{6}\right] \][/tex]
This matches the given result exactly.