4x^2+5x=380

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Solution for 4x^2+5x=380 equation:


Simplifying
4x2 + 5x = 380

Reorder the terms:
5x + 4x2 = 380

Solving
5x + 4x2 = 380

Solving for variable 'x'.

Reorder the terms:
-380 + 5x + 4x2 = 380 + -380

Combine like terms: 380 + -380 = 0
-380 + 5x + 4x2 = 0

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

Divide each side by '4'.
-95 + 1.25x + x2 = 0

Move the constant term to the right:

Add '95' to each side of the equation.
-95 + 1.25x + 95 + x2 = 0 + 95

Reorder the terms:
-95 + 95 + 1.25x + x2 = 0 + 95

Combine like terms: -95 + 95 = 0
0 + 1.25x + x2 = 0 + 95
1.25x + x2 = 0 + 95

Combine like terms: 0 + 95 = 95
1.25x + x2 = 95

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 = 95 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 95 + 0.390625

Combine like terms: 95 + 0.390625 = 95.390625
0.390625 + 1.25x + x2 = 95.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 95.390625

Calculate the square root of the right side: 9.766812428

Break this problem into two subproblems by setting 
(x + 0.625) equal to 9.766812428 and -9.766812428.

Subproblem 1

x + 0.625 = 9.766812428 Simplifying x + 0.625 = 9.766812428 Reorder the terms: 0.625 + x = 9.766812428 Solving 0.625 + x = 9.766812428 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 = 9.766812428 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 9.766812428 + -0.625 x = 9.766812428 + -0.625 Combine like terms: 9.766812428 + -0.625 = 9.141812428 x = 9.141812428 Simplifying x = 9.141812428

Subproblem 2

x + 0.625 = -9.766812428 Simplifying x + 0.625 = -9.766812428 Reorder the terms: 0.625 + x = -9.766812428 Solving 0.625 + x = -9.766812428 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 = -9.766812428 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -9.766812428 + -0.625 x = -9.766812428 + -0.625 Combine like terms: -9.766812428 + -0.625 = -10.391812428 x = -10.391812428 Simplifying x = -10.391812428

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.141812428, -10.391812428}

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