(2x+5)(x)=5625

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Solution for (2x+5)(x)=5625 equation:


Simplifying
(2x + 5)(x) = 5625

Reorder the terms:
(5 + 2x)(x) = 5625

Reorder the terms for easier multiplication:
x(5 + 2x) = 5625
(5 * x + 2x * x) = 5625
(5x + 2x2) = 5625

Solving
5x + 2x2 = 5625

Solving for variable 'x'.

Reorder the terms:
-5625 + 5x + 2x2 = 5625 + -5625

Combine like terms: 5625 + -5625 = 0
-5625 + 5x + 2x2 = 0

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

Divide each side by '2'.
-2812.5 + 2.5x + x2 = 0

Move the constant term to the right:

Add '2812.5' to each side of the equation.
-2812.5 + 2.5x + 2812.5 + x2 = 0 + 2812.5

Reorder the terms:
-2812.5 + 2812.5 + 2.5x + x2 = 0 + 2812.5

Combine like terms: -2812.5 + 2812.5 = 0.0
0.0 + 2.5x + x2 = 0 + 2812.5
2.5x + x2 = 0 + 2812.5

Combine like terms: 0 + 2812.5 = 2812.5
2.5x + x2 = 2812.5

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 2812.5 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 2812.5 + 1.5625

Combine like terms: 2812.5 + 1.5625 = 2814.0625
1.5625 + 2.5x + x2 = 2814.0625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 2814.0625

Calculate the square root of the right side: 53.047737935

Break this problem into two subproblems by setting 
(x + 1.25) equal to 53.047737935 and -53.047737935.

Subproblem 1

x + 1.25 = 53.047737935 Simplifying x + 1.25 = 53.047737935 Reorder the terms: 1.25 + x = 53.047737935 Solving 1.25 + x = 53.047737935 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 53.047737935 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 53.047737935 + -1.25 x = 53.047737935 + -1.25 Combine like terms: 53.047737935 + -1.25 = 51.797737935 x = 51.797737935 Simplifying x = 51.797737935

Subproblem 2

x + 1.25 = -53.047737935 Simplifying x + 1.25 = -53.047737935 Reorder the terms: 1.25 + x = -53.047737935 Solving 1.25 + x = -53.047737935 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -53.047737935 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -53.047737935 + -1.25 x = -53.047737935 + -1.25 Combine like terms: -53.047737935 + -1.25 = -54.297737935 x = -54.297737935 Simplifying x = -54.297737935

Solution

The solution to the problem is based on the solutions from the subproblems. x = {51.797737935, -54.297737935}

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