2x^2-6x-400=0

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Solution for 2x^2-6x-400=0 equation:


Simplifying
2x2 + -6x + -400 = 0

Reorder the terms:
-400 + -6x + 2x2 = 0

Solving
-400 + -6x + 2x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-200 + -3x + x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-200 + -3x + x2)' equal to zero and attempt to solve: Simplifying -200 + -3x + x2 = 0 Solving -200 + -3x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '200' to each side of the equation. -200 + -3x + 200 + x2 = 0 + 200 Reorder the terms: -200 + 200 + -3x + x2 = 0 + 200 Combine like terms: -200 + 200 = 0 0 + -3x + x2 = 0 + 200 -3x + x2 = 0 + 200 Combine like terms: 0 + 200 = 200 -3x + x2 = 200 The x term is -3x. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3x + 2.25 + x2 = 200 + 2.25 Reorder the terms: 2.25 + -3x + x2 = 200 + 2.25 Combine like terms: 200 + 2.25 = 202.25 2.25 + -3x + x2 = 202.25 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = 202.25 Calculate the square root of the right side: 14.221462653 Break this problem into two subproblems by setting (x + -1.5) equal to 14.221462653 and -14.221462653.

Subproblem 1

x + -1.5 = 14.221462653 Simplifying x + -1.5 = 14.221462653 Reorder the terms: -1.5 + x = 14.221462653 Solving -1.5 + x = 14.221462653 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 14.221462653 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 14.221462653 + 1.5 x = 14.221462653 + 1.5 Combine like terms: 14.221462653 + 1.5 = 15.721462653 x = 15.721462653 Simplifying x = 15.721462653

Subproblem 2

x + -1.5 = -14.221462653 Simplifying x + -1.5 = -14.221462653 Reorder the terms: -1.5 + x = -14.221462653 Solving -1.5 + x = -14.221462653 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -14.221462653 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -14.221462653 + 1.5 x = -14.221462653 + 1.5 Combine like terms: -14.221462653 + 1.5 = -12.721462653 x = -12.721462653 Simplifying x = -12.721462653

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.721462653, -12.721462653}

Solution

x = {15.721462653, -12.721462653}

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