3x+4x^2=56

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Solution for 3x+4x^2=56 equation:


Simplifying
3x + 4x2 = 56

Solving
3x + 4x2 = 56

Solving for variable 'x'.

Reorder the terms:
-56 + 3x + 4x2 = 56 + -56

Combine like terms: 56 + -56 = 0
-56 + 3x + 4x2 = 0

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

Divide each side by '4'.
-14 + 0.75x + x2 = 0

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 0.75x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + 0.75x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 0.75x + x2 = 0 + 14
0.75x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
0.75x + x2 = 14

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 14 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 14 + 0.140625

Combine like terms: 14 + 0.140625 = 14.140625
0.140625 + 0.75x + x2 = 14.140625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 14.140625

Calculate the square root of the right side: 3.760402239

Break this problem into two subproblems by setting 
(x + 0.375) equal to 3.760402239 and -3.760402239.

Subproblem 1

x + 0.375 = 3.760402239 Simplifying x + 0.375 = 3.760402239 Reorder the terms: 0.375 + x = 3.760402239 Solving 0.375 + x = 3.760402239 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 3.760402239 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 3.760402239 + -0.375 x = 3.760402239 + -0.375 Combine like terms: 3.760402239 + -0.375 = 3.385402239 x = 3.385402239 Simplifying x = 3.385402239

Subproblem 2

x + 0.375 = -3.760402239 Simplifying x + 0.375 = -3.760402239 Reorder the terms: 0.375 + x = -3.760402239 Solving 0.375 + x = -3.760402239 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -3.760402239 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -3.760402239 + -0.375 x = -3.760402239 + -0.375 Combine like terms: -3.760402239 + -0.375 = -4.135402239 x = -4.135402239 Simplifying x = -4.135402239

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.385402239, -4.135402239}

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