\( 8 k - 2 ) x ^ { 2 } - ( 1 - 2 k ) x + 2 - 5 k = 0 , \operatorname { con } k \neq \frac { 1 } { 4 } , \quad x , = - 1 \)
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To solve the quadratic equation \( (8k - 2)x^2 - (1 - 2k)x + (2 - 5k) = 0 \) with the condition \( k \neq \frac{1}{4} \) and check if \( x = -1 \) is a solution, start by substituting \( x = -1 \). Plugging in \( x = -1 \): \[ (8k - 2)(-1)^2 - (1 - 2k)(-1) + (2 - 5k) = 0 \] This simplifies to: \[ (8k - 2) + (1 - 2k) + (2 - 5k) = 0 \] Combining like terms: \[ 8k - 2 + 1 - 2k + 2 - 5k = 0 \] \[ (8k - 2k - 5k) + (1 + 2 - 2) = 0 \] \[ k + 1 = 0 \] Thus, we find: \[ k = -1 \] Next, verify whether \( k = -1 \) satisfies the initial condition \( k \neq \frac{1}{4} \). Since \(-1\) is not equal to \(\frac{1}{4}\), it is a valid solution. Therefore, the solution for \( k \) that makes \( x = -1 \) a solution is \( k = -1 \).