2x^2+4x-55=5

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Solution for 2x^2+4x-55=5 equation:


Simplifying
2x2 + 4x + -55 = 5

Reorder the terms:
-55 + 4x + 2x2 = 5

Solving
-55 + 4x + 2x2 = 5

Solving for variable 'x'.

Reorder the terms:
-55 + -5 + 4x + 2x2 = 5 + -5

Combine like terms: -55 + -5 = -60
-60 + 4x + 2x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-60 + 4x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-30 + 2x + x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-30 + 2x + x2)' equal to zero and attempt to solve: Simplifying -30 + 2x + x2 = 0 Solving -30 + 2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '30' to each side of the equation. -30 + 2x + 30 + x2 = 0 + 30 Reorder the terms: -30 + 30 + 2x + x2 = 0 + 30 Combine like terms: -30 + 30 = 0 0 + 2x + x2 = 0 + 30 2x + x2 = 0 + 30 Combine like terms: 0 + 30 = 30 2x + x2 = 30 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = 30 + 1 Reorder the terms: 1 + 2x + x2 = 30 + 1 Combine like terms: 30 + 1 = 31 1 + 2x + x2 = 31 Factor a perfect square on the left side: (x + 1)(x + 1) = 31 Calculate the square root of the right side: 5.567764363 Break this problem into two subproblems by setting (x + 1) equal to 5.567764363 and -5.567764363.

Subproblem 1

x + 1 = 5.567764363 Simplifying x + 1 = 5.567764363 Reorder the terms: 1 + x = 5.567764363 Solving 1 + x = 5.567764363 Solving for variable 'x'. 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 = 5.567764363 + -1 Combine like terms: 1 + -1 = 0 0 + x = 5.567764363 + -1 x = 5.567764363 + -1 Combine like terms: 5.567764363 + -1 = 4.567764363 x = 4.567764363 Simplifying x = 4.567764363

Subproblem 2

x + 1 = -5.567764363 Simplifying x + 1 = -5.567764363 Reorder the terms: 1 + x = -5.567764363 Solving 1 + x = -5.567764363 Solving for variable 'x'. 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 = -5.567764363 + -1 Combine like terms: 1 + -1 = 0 0 + x = -5.567764363 + -1 x = -5.567764363 + -1 Combine like terms: -5.567764363 + -1 = -6.567764363 x = -6.567764363 Simplifying x = -6.567764363

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.567764363, -6.567764363}

Solution

x = {4.567764363, -6.567764363}

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