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Question

Find the roots of the following equation:
$4x^2 + 4x - 3 = 0$

The correct answer is

$-\frac{3}{2}, \frac{1}{2}$

Solving the Quadratic Equation $4x^2 + 4x - 3 = 0$

To find the roots of the quadratic equation $4x^2 + 4x - 3 = 0$, we can use the factorization method.

Factorization Steps

  1. Identify Coefficients: The equation is in the form $ax^2 + bx + c = 0$, where $a=4$, $b=4$, and $c=-3$.
  2. Find Product and Sum: We need two numbers that multiply to $a \times c = 4 \times (-3) = -12$ and add up to $b = 4$. These numbers are $6$ and $-2$.
  3. Rewrite Middle Term: Rewrite the equation by splitting the middle term ($4x$) using these numbers:

    $4x^2 + 6x - 2x - 3 = 0$

  4. Factor by Grouping: Group the terms and factor out common factors:

    $2x(2x + 3) - 1(2x + 3) = 0$

  5. Factor Common Binomial: Factor out the common binomial $(2x + 3)$:

    $(2x - 1)(2x + 3) = 0$

  6. Solve for x: Set each factor equal to zero and solve for $x$:
    • $2x - 1 = 0 \implies 2x = 1 \implies x = \frac{1}{2}$
    • $2x + 3 = 0 \implies 2x = -3 \implies x = -\frac{3}{2}$

Conclusion

The roots of the equation $4x^2 + 4x - 3 = 0$ are $x = \frac{1}{2}$ and $x = -\frac{3}{2}$.

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Important Questions from Quadratic Equations

  1. If k = c, then the roots of the equation are:

  2. If \(\rm {k}=\frac{{c}}{2},({c} \neq 0)\), then the roots of the equation are :

  3. What is the number of real roots of the equation?

  4. What is the sum of all the roots of the equation?

  5. If α and β are the distinct roots of equation x2 - x + 1 = 0, then what is the value of \(\left|\frac{\alpha^{100}+\beta^{100}}{\alpha^{100}-\beta^{100}}\right|\) ?

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