2x^2+(k-1)x-1=0

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Solution for 2x^2+(k-1)x-1=0 equation:


Simplifying
2x2 + (k + -1) * x + -1 = 0

Reorder the terms:
2x2 + (-1 + k) * x + -1 = 0

Reorder the terms for easier multiplication:
2x2 + x(-1 + k) + -1 = 0
2x2 + (-1 * x + k * x) + -1 = 0

Reorder the terms:
2x2 + (kx + -1x) + -1 = 0
2x2 + (kx + -1x) + -1 = 0

Reorder the terms:
-1 + kx + -1x + 2x2 = 0

Solving
-1 + kx + -1x + 2x2 = 0

Solving for variable 'k'.

Move all terms containing k to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + kx + -1x + 1 + 2x2 = 0 + 1

Reorder the terms:
-1 + 1 + kx + -1x + 2x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + kx + -1x + 2x2 = 0 + 1
kx + -1x + 2x2 = 0 + 1

Combine like terms: 0 + 1 = 1
kx + -1x + 2x2 = 1

Add 'x' to each side of the equation.
kx + -1x + x + 2x2 = 1 + x

Combine like terms: -1x + x = 0
kx + 0 + 2x2 = 1 + x
kx + 2x2 = 1 + x

Add '-2x2' to each side of the equation.
kx + 2x2 + -2x2 = 1 + x + -2x2

Combine like terms: 2x2 + -2x2 = 0
kx + 0 = 1 + x + -2x2
kx = 1 + x + -2x2

Divide each side by 'x'.
k = x-1 + 1 + -2x

Simplifying
k = x-1 + 1 + -2x

Reorder the terms:
k = 1 + x-1 + -2x

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