(x)(4x+5)=520

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Solution for (x)(4x+5)=520 equation:


Simplifying
(x)(4x + 5) = 520

Reorder the terms:
x(5 + 4x) = 520
(5 * x + 4x * x) = 520
(5x + 4x2) = 520

Solving
5x + 4x2 = 520

Solving for variable 'x'.

Reorder the terms:
-520 + 5x + 4x2 = 520 + -520

Combine like terms: 520 + -520 = 0
-520 + 5x + 4x2 = 0

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

Divide each side by '4'.
-130 + 1.25x + x2 = 0

Move the constant term to the right:

Add '130' to each side of the equation.
-130 + 1.25x + 130 + x2 = 0 + 130

Reorder the terms:
-130 + 130 + 1.25x + x2 = 0 + 130

Combine like terms: -130 + 130 = 0
0 + 1.25x + x2 = 0 + 130
1.25x + x2 = 0 + 130

Combine like terms: 0 + 130 = 130
1.25x + x2 = 130

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 = 130 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 130 + 0.390625

Combine like terms: 130 + 0.390625 = 130.390625
0.390625 + 1.25x + x2 = 130.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 130.390625

Calculate the square root of the right side: 11.418871442

Break this problem into two subproblems by setting 
(x + 0.625) equal to 11.418871442 and -11.418871442.

Subproblem 1

x + 0.625 = 11.418871442 Simplifying x + 0.625 = 11.418871442 Reorder the terms: 0.625 + x = 11.418871442 Solving 0.625 + x = 11.418871442 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 = 11.418871442 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 11.418871442 + -0.625 x = 11.418871442 + -0.625 Combine like terms: 11.418871442 + -0.625 = 10.793871442 x = 10.793871442 Simplifying x = 10.793871442

Subproblem 2

x + 0.625 = -11.418871442 Simplifying x + 0.625 = -11.418871442 Reorder the terms: 0.625 + x = -11.418871442 Solving 0.625 + x = -11.418871442 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 = -11.418871442 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -11.418871442 + -0.625 x = -11.418871442 + -0.625 Combine like terms: -11.418871442 + -0.625 = -12.043871442 x = -12.043871442 Simplifying x = -12.043871442

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.793871442, -12.043871442}

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