4x^2+5x=12

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Solution for 4x^2+5x=12 equation:


Simplifying
4x2 + 5x = 12

Reorder the terms:
5x + 4x2 = 12

Solving
5x + 4x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + 5x + 4x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + 5x + 4x2 = 0

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

Divide each side by '4'.
-3 + 1.25x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 1.25x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 1.25x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 1.25x + x2 = 0 + 3
1.25x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
1.25x + x2 = 3

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 = 3 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 3 + 0.390625

Combine like terms: 3 + 0.390625 = 3.390625
0.390625 + 1.25x + x2 = 3.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 3.390625

Calculate the square root of the right side: 1.841364983

Break this problem into two subproblems by setting 
(x + 0.625) equal to 1.841364983 and -1.841364983.

Subproblem 1

x + 0.625 = 1.841364983 Simplifying x + 0.625 = 1.841364983 Reorder the terms: 0.625 + x = 1.841364983 Solving 0.625 + x = 1.841364983 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 = 1.841364983 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 1.841364983 + -0.625 x = 1.841364983 + -0.625 Combine like terms: 1.841364983 + -0.625 = 1.216364983 x = 1.216364983 Simplifying x = 1.216364983

Subproblem 2

x + 0.625 = -1.841364983 Simplifying x + 0.625 = -1.841364983 Reorder the terms: 0.625 + x = -1.841364983 Solving 0.625 + x = -1.841364983 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 = -1.841364983 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -1.841364983 + -0.625 x = -1.841364983 + -0.625 Combine like terms: -1.841364983 + -0.625 = -2.466364983 x = -2.466364983 Simplifying x = -2.466364983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.216364983, -2.466364983}

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