(5x-7)(x+5)=23

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Solution for (5x-7)(x+5)=23 equation:


Simplifying
(5x + -7)(x + 5) = 23

Reorder the terms:
(-7 + 5x)(x + 5) = 23

Reorder the terms:
(-7 + 5x)(5 + x) = 23

Multiply (-7 + 5x) * (5 + x)
(-7(5 + x) + 5x * (5 + x)) = 23
((5 * -7 + x * -7) + 5x * (5 + x)) = 23
((-35 + -7x) + 5x * (5 + x)) = 23
(-35 + -7x + (5 * 5x + x * 5x)) = 23
(-35 + -7x + (25x + 5x2)) = 23

Combine like terms: -7x + 25x = 18x
(-35 + 18x + 5x2) = 23

Solving
-35 + 18x + 5x2 = 23

Solving for variable 'x'.

Reorder the terms:
-35 + -23 + 18x + 5x2 = 23 + -23

Combine like terms: -35 + -23 = -58
-58 + 18x + 5x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-58 + 18x + 5x2 = 0

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

Divide each side by '5'.
-11.6 + 3.6x + x2 = 0

Move the constant term to the right:

Add '11.6' to each side of the equation.
-11.6 + 3.6x + 11.6 + x2 = 0 + 11.6

Reorder the terms:
-11.6 + 11.6 + 3.6x + x2 = 0 + 11.6

Combine like terms: -11.6 + 11.6 = 0.0
0.0 + 3.6x + x2 = 0 + 11.6
3.6x + x2 = 0 + 11.6

Combine like terms: 0 + 11.6 = 11.6
3.6x + x2 = 11.6

The x term is 3.6x.  Take half its coefficient (1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
3.6x + 3.24 + x2 = 11.6 + 3.24

Reorder the terms:
3.24 + 3.6x + x2 = 11.6 + 3.24

Combine like terms: 11.6 + 3.24 = 14.84
3.24 + 3.6x + x2 = 14.84

Factor a perfect square on the left side:
(x + 1.8)(x + 1.8) = 14.84

Calculate the square root of the right side: 3.852272057

Break this problem into two subproblems by setting 
(x + 1.8) equal to 3.852272057 and -3.852272057.

Subproblem 1

x + 1.8 = 3.852272057 Simplifying x + 1.8 = 3.852272057 Reorder the terms: 1.8 + x = 3.852272057 Solving 1.8 + x = 3.852272057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.8' to each side of the equation. 1.8 + -1.8 + x = 3.852272057 + -1.8 Combine like terms: 1.8 + -1.8 = 0.0 0.0 + x = 3.852272057 + -1.8 x = 3.852272057 + -1.8 Combine like terms: 3.852272057 + -1.8 = 2.052272057 x = 2.052272057 Simplifying x = 2.052272057

Subproblem 2

x + 1.8 = -3.852272057 Simplifying x + 1.8 = -3.852272057 Reorder the terms: 1.8 + x = -3.852272057 Solving 1.8 + x = -3.852272057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.8' to each side of the equation. 1.8 + -1.8 + x = -3.852272057 + -1.8 Combine like terms: 1.8 + -1.8 = 0.0 0.0 + x = -3.852272057 + -1.8 x = -3.852272057 + -1.8 Combine like terms: -3.852272057 + -1.8 = -5.652272057 x = -5.652272057 Simplifying x = -5.652272057

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.052272057, -5.652272057}

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