21c^2-14c-7=0

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Solution for 21c^2-14c-7=0 equation:


Simplifying
21c2 + -14c + -7 = 0

Reorder the terms:
-7 + -14c + 21c2 = 0

Solving
-7 + -14c + 21c2 = 0

Solving for variable 'c'.

Factor out the Greatest Common Factor (GCF), '7'.
7(-1 + -2c + 3c2) = 0

Factor a trinomial.
7((-1 + -3c)(1 + -1c)) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(-1 + -3c)' equal to zero and attempt to solve: Simplifying -1 + -3c = 0 Solving -1 + -3c = 0 Move all terms containing c to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -3c = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -3c = 0 + 1 -3c = 0 + 1 Combine like terms: 0 + 1 = 1 -3c = 1 Divide each side by '-3'. c = -0.3333333333 Simplifying c = -0.3333333333

Subproblem 2

Set the factor '(1 + -1c)' equal to zero and attempt to solve: Simplifying 1 + -1c = 0 Solving 1 + -1c = 0 Move all terms containing c to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -1c = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1c = 0 + -1 -1c = 0 + -1 Combine like terms: 0 + -1 = -1 -1c = -1 Divide each side by '-1'. c = 1 Simplifying c = 1

Solution

c = {-0.3333333333, 1}

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