If the equation (k ^ 2-1) x ^ 2-kx = 3 about X is a quadratic equation of one variable, find K

Because it's a quadratic equation of one variable
So K & # 178; - 1 ≠ 0
So K & # 178; ≠ 1
So K ≠ 1 and K ≠ - 1

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