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Salio in quadratic oquation by facturizing \( 4 x^{2}+4 x-3=0 \)

Ask by Salazar Moran. in South Africa
Jan 23,2025

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Tutor-Verified Answer

Answer

The solutions are \( x = -\frac{3}{2} \) and \( x = \frac{1}{2} \).

Solution

Solve the quadratic equation by following steps: - step0: Solve by factoring: \(4x^{2}+4x-3=0\) - step1: Factor the expression: \(\left(2x-1\right)\left(2x+3\right)=0\) - step2: Separate into possible cases: \(\begin{align}&2x-1=0\\&2x+3=0\end{align}\) - step3: Solve the equation: \(\begin{align}&x=\frac{1}{2}\\&x=-\frac{3}{2}\end{align}\) - step4: Rewrite: \(x_{1}=-\frac{3}{2},x_{2}=\frac{1}{2}\) To solve the quadratic equation \( 4x^{2} + 4x - 3 = 0 \) by factoring, we can follow these steps: 1. **Identify the coefficients**: In the equation \( ax^2 + bx + c = 0 \), we have: - \( a = 4 \) - \( b = 4 \) - \( c = -3 \) 2. **Factor the quadratic**: We need to find two numbers that multiply to \( ac = 4 \times -3 = -12 \) and add to \( b = 4 \). The numbers that satisfy this are \( 6 \) and \( -2 \). 3. **Rewrite the equation**: We can rewrite the middle term using these numbers: \[ 4x^{2} + 6x - 2x - 3 = 0 \] 4. **Group the terms**: Now, we group the terms: \[ (4x^{2} + 6x) + (-2x - 3) = 0 \] 5. **Factor by grouping**: \[ 2x(2x + 3) - 1(2x + 3) = 0 \] This can be factored as: \[ (2x + 3)(2x - 1) = 0 \] 6. **Set each factor to zero**: \[ 2x + 3 = 0 \quad \text{or} \quad 2x - 1 = 0 \] 7. **Solve for \( x \)**: - From \( 2x + 3 = 0 \): \[ 2x = -3 \implies x = -\frac{3}{2} \] - From \( 2x - 1 = 0 \): \[ 2x = 1 \implies x = \frac{1}{2} \] Thus, the solutions to the equation \( 4x^{2} + 4x - 3 = 0 \) are: \[ x_{1} = -\frac{3}{2}, \quad x_{2} = \frac{1}{2} \]

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Bonus Knowledge

To factor the quadratic equation \( 4x^2 + 4x - 3 = 0 \), we first look for two numbers that multiply to \( ac = 4 \times -3 = -12 \) and add to \( b = 4 \). The numbers 6 and -2 fit perfectly! So, we rewrite the equation as \( 4x^2 + 6x - 2x - 3 = 0 \), which we can group into \( (4x^2 + 6x) + (-2x - 3) = 0 \). This factors into \( 2x(2x + 3) - 1(2x + 3) = 0 \), leading to \( (2x + 3)(2x - 1) = 0 \). The solutions are \( x = -\frac{3}{2} \) and \( x = \frac{1}{2} \). The history of quadratic equations is quite fascinating! They date back to ancient civilizations like the Babylonians, who used geometric methods to solve problems similar to quadratic equations around 2000 BCE. Over centuries, mathematicians like Al-Khwarizmi and later Descartes formalized and simplified these methods, leading to our modern approach to solving, including factoring, completing the square, and applying the quadratic formula. It's a testament to how mathematical concepts can evolve while retaining their fundamentals!

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