0=21x^2+14x-7

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


Simplifying
0 = 21x2 + 14x + -7

Reorder the terms:
0 = -7 + 14x + 21x2

Solving
0 = -7 + 14x + 21x2

Solving for variable 'x'.

Combine like terms: 0 + 7 = 7
7 + -14x + -21x2 = -7 + 14x + 21x2 + 7 + -14x + -21x2

Reorder the terms:
7 + -14x + -21x2 = -7 + 7 + 14x + -14x + 21x2 + -21x2

Combine like terms: -7 + 7 = 0
7 + -14x + -21x2 = 0 + 14x + -14x + 21x2 + -21x2
7 + -14x + -21x2 = 14x + -14x + 21x2 + -21x2

Combine like terms: 14x + -14x = 0
7 + -14x + -21x2 = 0 + 21x2 + -21x2
7 + -14x + -21x2 = 21x2 + -21x2

Combine like terms: 21x2 + -21x2 = 0
7 + -14x + -21x2 = 0

Factor out the Greatest Common Factor (GCF), '7'.
7(1 + -2x + -3x2) = 0

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

Ignore the factor 7.

Subproblem 1

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

Subproblem 2

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

Solution

x = {0.3333333333, -1}

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