4x^2+7x-136=0

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Solution for 4x^2+7x-136=0 equation:


Simplifying
4x2 + 7x + -136 = 0

Reorder the terms:
-136 + 7x + 4x2 = 0

Solving
-136 + 7x + 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'.
-34 + 1.75x + x2 = 0

Move the constant term to the right:

Add '34' to each side of the equation.
-34 + 1.75x + 34 + x2 = 0 + 34

Reorder the terms:
-34 + 34 + 1.75x + x2 = 0 + 34

Combine like terms: -34 + 34 = 0
0 + 1.75x + x2 = 0 + 34
1.75x + x2 = 0 + 34

Combine like terms: 0 + 34 = 34
1.75x + x2 = 34

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = 34 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 34 + 0.765625

Combine like terms: 34 + 0.765625 = 34.765625
0.765625 + 1.75x + x2 = 34.765625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 34.765625

Calculate the square root of the right side: 5.896238208

Break this problem into two subproblems by setting 
(x + 0.875) equal to 5.896238208 and -5.896238208.

Subproblem 1

x + 0.875 = 5.896238208 Simplifying x + 0.875 = 5.896238208 Reorder the terms: 0.875 + x = 5.896238208 Solving 0.875 + x = 5.896238208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 5.896238208 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 5.896238208 + -0.875 x = 5.896238208 + -0.875 Combine like terms: 5.896238208 + -0.875 = 5.021238208 x = 5.021238208 Simplifying x = 5.021238208

Subproblem 2

x + 0.875 = -5.896238208 Simplifying x + 0.875 = -5.896238208 Reorder the terms: 0.875 + x = -5.896238208 Solving 0.875 + x = -5.896238208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -5.896238208 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -5.896238208 + -0.875 x = -5.896238208 + -0.875 Combine like terms: -5.896238208 + -0.875 = -6.771238208 x = -6.771238208 Simplifying x = -6.771238208

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.021238208, -6.771238208}

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