x(4x+7)=440

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Solution for x(4x+7)=440 equation:


Simplifying
x(4x + 7) = 440

Reorder the terms:
x(7 + 4x) = 440
(7 * x + 4x * x) = 440
(7x + 4x2) = 440

Solving
7x + 4x2 = 440

Solving for variable 'x'.

Reorder the terms:
-440 + 7x + 4x2 = 440 + -440

Combine like terms: 440 + -440 = 0
-440 + 7x + 4x2 = 0

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

Divide each side by '4'.
-110 + 1.75x + x2 = 0

Move the constant term to the right:

Add '110' to each side of the equation.
-110 + 1.75x + 110 + x2 = 0 + 110

Reorder the terms:
-110 + 110 + 1.75x + x2 = 0 + 110

Combine like terms: -110 + 110 = 0
0 + 1.75x + x2 = 0 + 110
1.75x + x2 = 0 + 110

Combine like terms: 0 + 110 = 110
1.75x + x2 = 110

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 = 110 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 110 + 0.765625

Combine like terms: 110 + 0.765625 = 110.765625
0.765625 + 1.75x + x2 = 110.765625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 110.765625

Calculate the square root of the right side: 10.52452493

Break this problem into two subproblems by setting 
(x + 0.875) equal to 10.52452493 and -10.52452493.

Subproblem 1

x + 0.875 = 10.52452493 Simplifying x + 0.875 = 10.52452493 Reorder the terms: 0.875 + x = 10.52452493 Solving 0.875 + x = 10.52452493 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 = 10.52452493 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 10.52452493 + -0.875 x = 10.52452493 + -0.875 Combine like terms: 10.52452493 + -0.875 = 9.64952493 x = 9.64952493 Simplifying x = 9.64952493

Subproblem 2

x + 0.875 = -10.52452493 Simplifying x + 0.875 = -10.52452493 Reorder the terms: 0.875 + x = -10.52452493 Solving 0.875 + x = -10.52452493 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 = -10.52452493 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -10.52452493 + -0.875 x = -10.52452493 + -0.875 Combine like terms: -10.52452493 + -0.875 = -11.39952493 x = -11.39952493 Simplifying x = -11.39952493

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.64952493, -11.39952493}

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