2x^2-7x-56=0

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Solution for 2x^2-7x-56=0 equation:


Simplifying
2x2 + -7x + -56 = 0

Reorder the terms:
-56 + -7x + 2x2 = 0

Solving
-56 + -7x + 2x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-28 + -3.5x + x2 = 0

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + -3.5x + 28 + x2 = 0 + 28

Reorder the terms:
-28 + 28 + -3.5x + x2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + -3.5x + x2 = 0 + 28
-3.5x + x2 = 0 + 28

Combine like terms: 0 + 28 = 28
-3.5x + x2 = 28

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 28 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 28 + 3.0625

Combine like terms: 28 + 3.0625 = 31.0625
3.0625 + -3.5x + x2 = 31.0625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 31.0625

Calculate the square root of the right side: 5.573374202

Break this problem into two subproblems by setting 
(x + -1.75) equal to 5.573374202 and -5.573374202.

Subproblem 1

x + -1.75 = 5.573374202 Simplifying x + -1.75 = 5.573374202 Reorder the terms: -1.75 + x = 5.573374202 Solving -1.75 + x = 5.573374202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 5.573374202 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 5.573374202 + 1.75 x = 5.573374202 + 1.75 Combine like terms: 5.573374202 + 1.75 = 7.323374202 x = 7.323374202 Simplifying x = 7.323374202

Subproblem 2

x + -1.75 = -5.573374202 Simplifying x + -1.75 = -5.573374202 Reorder the terms: -1.75 + x = -5.573374202 Solving -1.75 + x = -5.573374202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -5.573374202 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -5.573374202 + 1.75 x = -5.573374202 + 1.75 Combine like terms: -5.573374202 + 1.75 = -3.823374202 x = -3.823374202 Simplifying x = -3.823374202

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.323374202, -3.823374202}

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