-14x^2+84x+84=0

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Solution for -14x^2+84x+84=0 equation:


Simplifying
-14x2 + 84x + 84 = 0

Reorder the terms:
84 + 84x + -14x2 = 0

Solving
84 + 84x + -14x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '14'.
14(6 + 6x + -1x2) = 0

Ignore the factor 14.

Subproblem 1

Set the factor '(6 + 6x + -1x2)' equal to zero and attempt to solve: Simplifying 6 + 6x + -1x2 = 0 Solving 6 + 6x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -6 + -6x + x2 = 0 Move the constant term to the right: Add '6' to each side of the equation. -6 + -6x + 6 + x2 = 0 + 6 Reorder the terms: -6 + 6 + -6x + x2 = 0 + 6 Combine like terms: -6 + 6 = 0 0 + -6x + x2 = 0 + 6 -6x + x2 = 0 + 6 Combine like terms: 0 + 6 = 6 -6x + x2 = 6 The x term is -6x. Take half its coefficient (-3). Square it (9) and add it to both sides. Add '9' to each side of the equation. -6x + 9 + x2 = 6 + 9 Reorder the terms: 9 + -6x + x2 = 6 + 9 Combine like terms: 6 + 9 = 15 9 + -6x + x2 = 15 Factor a perfect square on the left side: (x + -3)(x + -3) = 15 Calculate the square root of the right side: 3.872983346 Break this problem into two subproblems by setting (x + -3) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + -3 = 3.872983346 Simplifying x + -3 = 3.872983346 Reorder the terms: -3 + x = 3.872983346 Solving -3 + x = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 3.872983346 + 3 Combine like terms: -3 + 3 = 0 0 + x = 3.872983346 + 3 x = 3.872983346 + 3 Combine like terms: 3.872983346 + 3 = 6.872983346 x = 6.872983346 Simplifying x = 6.872983346

Subproblem 2

x + -3 = -3.872983346 Simplifying x + -3 = -3.872983346 Reorder the terms: -3 + x = -3.872983346 Solving -3 + x = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -3.872983346 + 3 Combine like terms: -3 + 3 = 0 0 + x = -3.872983346 + 3 x = -3.872983346 + 3 Combine like terms: -3.872983346 + 3 = -0.872983346 x = -0.872983346 Simplifying x = -0.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.872983346, -0.872983346}

Solution

x = {6.872983346, -0.872983346}

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