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2.1. Given \( \frac{4 x-3}{x^{2}}=m \), if -4 is one of the roots of the equation, determine the value of \( m \) and the other root.

Ask by Li Powell. in South Africa
Feb 21,2025

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Tutor-Verified Answer

Answer

\( m = -\frac{19}{16} \) and the other root is \( \frac{12}{19} \).

Solution

Solve the equation \( 4x-3=m*x^{2} \). Solve the equation by following steps: - step0: Solve for \(x\): \(4x-3=mx^{2}\) - step1: Move the expression to the left side: \(4x-3-mx^{2}=0\) - step2: Rewrite in standard form: \(-mx^{2}+4x-3=0\) - step3: Solve using the quadratic formula: \(x=\frac{-4\pm \sqrt{4^{2}-4\left(-m\right)\left(-3\right)}}{2\left(-m\right)}\) - step4: Simplify the expression: \(x=\frac{-4\pm \sqrt{4^{2}-4\left(-m\right)\left(-3\right)}}{-2m}\) - step5: Simplify the expression: \(x=\frac{-4\pm \sqrt{16-12m}}{-2m}\) - step6: Simplify the expression: \(x=\frac{-4\pm 2\sqrt{4-3m}}{-2m}\) - step7: Separate into possible cases: \(\begin{align}&x=\frac{-4+2\sqrt{4-3m}}{-2m}\\&x=\frac{-4-2\sqrt{4-3m}}{-2m}\end{align}\) - step8: Simplify the expression: \(\begin{align}&x=\frac{2-\sqrt{4-3m}}{m}\\&x=\frac{-4-2\sqrt{4-3m}}{-2m}\end{align}\) - step9: Simplify the expression: \(\begin{align}&x=\frac{2-\sqrt{4-3m}}{m}\\&x=\frac{2+\sqrt{4-3m}}{m}\end{align}\) The roots of the equation \(4x-3=m*x^{2}\) are given by the solutions to the quadratic equation \(4x-3=m*x^{2}\). Given that -4 is one of the roots, we can substitute \(x=-4\) into the equation to find the value of \(m\). Substituting \(x=-4\) into the equation \(4x-3=m*x^{2}\), we get: \[4(-4)-3=m*(-4)^{2}\] Simplifying this equation, we have: \[-16-3=16m\] \[-19=16m\] \[m=-\frac{19}{16}\] Therefore, the value of \(m\) is \(-\frac{19}{16}\). To find the other root, we can substitute \(m=-\frac{19}{16}\) back into the solutions for \(x\): \[x=\frac{2-\sqrt{4-3m}}{m}\] \[x=\frac{2-\sqrt{4-3(-\frac{19}{16})}}{-\frac{19}{16}}\] \[x=\frac{2-\sqrt{4+\frac{57}{16}}}{-\frac{19}{16}}\] \[x=\frac{2-\sqrt{\frac{64+57}{16}}}{-\frac{19}{16}}\] \[x=\frac{2-\sqrt{\frac{121}{16}}}{-\frac{19}{16}}\] \[x=\frac{2-\frac{11}{4}}{-\frac{19}{16}}\] \[x=\frac{\frac{8-11}{4}}{-\frac{19}{16}}\] \[x=\frac{-\frac{3}{4}}{-\frac{19}{16}}\] \[x=\frac{3}{4} \times \frac{16}{19}\] \[x=\frac{12}{19}\] Therefore, the other root of the equation is \(\frac{12}{19}\).

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To find the value of \( m \) when -4 is a root of the equation \( \frac{4x - 3}{x^2} = m \), we first substitute \( x = -4 \) into the equation: \[ \frac{4(-4) - 3}{(-4)^2} = m \implies \frac{-16 - 3}{16} = m \implies \frac{-19}{16} = m. \] Now, the equation can be rearranged to \( 4x - 3 = mx^2 \), leading to the quadratic form \( mx^2 - 4x + 3 = 0 \). Substituting \( m = -\frac{19}{16} \): \[ -\frac{19}{16}x^2 - 4x + 3 = 0. \] Multiplying through by -16 to eliminate the fraction, we get: \[ 19x^2 + 64x - 48 = 0. \] To find the other root, we can use the quadratic formula \( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \): \[ x = \frac{-64 \pm \sqrt{64^2 - 4 \cdot 19 \cdot (-48)}}{2 \cdot 19}. \] Calculating the discriminant: \[ 64^2 = 4096, \] \[ -4 \cdot 19 \cdot (-48) = 3648 \implies 4096 + 3648 = 7744. \] So, \[ \sqrt{7744} = 88. \] Now substitute back into the formula: \[ x = \frac{-64 \pm 88}{38} \Rightarrow x_1 = \frac{24}{38} = \frac{12}{19}, \quad x_2 = \frac{-152}{38} = -4. \] Thus, the value of \( m \) is \( -\frac{19}{16} \), and the other root is \( \frac{12}{19} \).

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