2x^2+4x-c=0

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Solution for 2x^2+4x-c=0 equation:


Simplifying
2x2 + 4x + -1c = 0

Reorder the terms:
-1c + 4x + 2x2 = 0

Solving
-1c + 4x + 2x2 = 0

Solving for variable 'c'.

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

Add '-4x' to each side of the equation.
-1c + 4x + -4x + 2x2 = 0 + -4x

Combine like terms: 4x + -4x = 0
-1c + 0 + 2x2 = 0 + -4x
-1c + 2x2 = 0 + -4x
Remove the zero:
-1c + 2x2 = -4x

Add '-2x2' to each side of the equation.
-1c + 2x2 + -2x2 = -4x + -2x2

Combine like terms: 2x2 + -2x2 = 0
-1c + 0 = -4x + -2x2
-1c = -4x + -2x2

Divide each side by '-1'.
c = 4x + 2x2

Simplifying
c = 4x + 2x2

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