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Solve for \( x \) in the following equation by the quadratic formula method \( (3-5 x)^{2}=(2 x+2)^{2} \)

Ask by Edwards Ryan. in South Africa
Mar 09,2025

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Answer

The solutions are \( x = \frac{1}{7} \) and \( x = \frac{5}{3} \).

Solution

Solve the equation \( (3-5x)^2=(2x+2)^2 \). Solve the quadratic equation by following steps: - step0: Solve by factoring: \(\left(3-5x\right)^{2}=\left(2x+2\right)^{2}\) - step1: Expand the expression: \(9-30x+25x^{2}=4x^{2}+8x+4\) - step2: Move the expression to the left side: \(5-38x+21x^{2}=0\) - step3: Factor the expression: \(\left(5-3x\right)\left(1-7x\right)=0\) - step4: Separate into possible cases: \(\begin{align}&5-3x=0\\&1-7x=0\end{align}\) - step5: Solve the equation: \(\begin{align}&x=\frac{5}{3}\\&x=\frac{1}{7}\end{align}\) - step6: Rewrite: \(x_{1}=\frac{1}{7},x_{2}=\frac{5}{3}\) The solutions to the equation \( (3-5x)^{2}=(2x+2)^{2} \) using the quadratic formula method are \( x_{1}=\frac{1}{7} \) and \( x_{2}=\frac{5}{3} \).

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To solve the equation \( (3-5x)^{2}=(2x+2)^{2} \), we start by expanding both sides. Expanding the left side: \[ (3 - 5x)^{2} = 9 - 30x + 25x^{2} \] Expanding the right side: \[ (2x + 2)^{2} = 4x^{2} + 8x + 4 \] Now, we set both expanded forms equal to each other: \[ 9 - 30x + 25x^{2} = 4x^{2} + 8x + 4 \] Next, we move everything to one side of the equation to set it to 0: \[ 25x^{2} - 4x^{2} - 30x - 8x + 9 - 4 = 0 \] \[ 21x^{2} - 38x + 5 = 0 \] Now, we apply the quadratic formula \( x = \frac{-b \pm \sqrt{b^{2} - 4ac}}{2a} \), where \( a = 21, b = -38, c = 5 \). Calculating the discriminant: \[ b^{2} - 4ac = (-38)^{2} - 4(21)(5) = 1444 - 420 = 1024 \] Now substituting into the quadratic formula: \[ x = \frac{-(-38) \pm \sqrt{1024}}{2(21)} = \frac{38 \pm 32}{42} \] This gives us two potential solutions: \[ x_1 = \frac{70}{42} = \frac{5}{3} \] \[ x_2 = \frac{6}{42} = \frac{1}{7} \] Thus, the solutions for \( x \) are \( \frac{5}{3} \) and \( \frac{1}{7} \).

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