4x^2+5x-251=0

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Solution for 4x^2+5x-251=0 equation:


Simplifying
4x2 + 5x + -251 = 0

Reorder the terms:
-251 + 5x + 4x2 = 0

Solving
-251 + 5x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-62.75 + 1.25x + x2 = 0

Move the constant term to the right:

Add '62.75' to each side of the equation.
-62.75 + 1.25x + 62.75 + x2 = 0 + 62.75

Reorder the terms:
-62.75 + 62.75 + 1.25x + x2 = 0 + 62.75

Combine like terms: -62.75 + 62.75 = 0.00
0.00 + 1.25x + x2 = 0 + 62.75
1.25x + x2 = 0 + 62.75

Combine like terms: 0 + 62.75 = 62.75
1.25x + x2 = 62.75

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 62.75 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 62.75 + 0.390625

Combine like terms: 62.75 + 0.390625 = 63.140625
0.390625 + 1.25x + x2 = 63.140625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 63.140625

Calculate the square root of the right side: 7.946107538

Break this problem into two subproblems by setting 
(x + 0.625) equal to 7.946107538 and -7.946107538.

Subproblem 1

x + 0.625 = 7.946107538 Simplifying x + 0.625 = 7.946107538 Reorder the terms: 0.625 + x = 7.946107538 Solving 0.625 + x = 7.946107538 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 7.946107538 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 7.946107538 + -0.625 x = 7.946107538 + -0.625 Combine like terms: 7.946107538 + -0.625 = 7.321107538 x = 7.321107538 Simplifying x = 7.321107538

Subproblem 2

x + 0.625 = -7.946107538 Simplifying x + 0.625 = -7.946107538 Reorder the terms: 0.625 + x = -7.946107538 Solving 0.625 + x = -7.946107538 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -7.946107538 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -7.946107538 + -0.625 x = -7.946107538 + -0.625 Combine like terms: -7.946107538 + -0.625 = -8.571107538 x = -8.571107538 Simplifying x = -8.571107538

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.321107538, -8.571107538}

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