-4(x-3)3(x+5)=25

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Solution for -4(x-3)3(x+5)=25 equation:


Simplifying
-4(x + -3) * 3(x + 5) = 25

Reorder the terms:
-4(-3 + x) * 3(x + 5) = 25

Reorder the terms:
-4(-3 + x) * 3(5 + x) = 25

Reorder the terms for easier multiplication:
-4 * 3(-3 + x)(5 + x) = 25

Multiply -4 * 3
-12(-3 + x)(5 + x) = 25

Multiply (-3 + x) * (5 + x)
-12(-3(5 + x) + x(5 + x)) = 25
-12((5 * -3 + x * -3) + x(5 + x)) = 25
-12((-15 + -3x) + x(5 + x)) = 25
-12(-15 + -3x + (5 * x + x * x)) = 25
-12(-15 + -3x + (5x + x2)) = 25

Combine like terms: -3x + 5x = 2x
-12(-15 + 2x + x2) = 25
(-15 * -12 + 2x * -12 + x2 * -12) = 25
(180 + -24x + -12x2) = 25

Solving
180 + -24x + -12x2 = 25

Solving for variable 'x'.

Reorder the terms:
180 + -25 + -24x + -12x2 = 25 + -25

Combine like terms: 180 + -25 = 155
155 + -24x + -12x2 = 25 + -25

Combine like terms: 25 + -25 = 0
155 + -24x + -12x2 = 0

Begin completing the square.  Divide all terms by
-12 the coefficient of the squared term: 

Divide each side by '-12'.
-12.91666667 + 2x + x2 = 0

Move the constant term to the right:

Add '12.91666667' to each side of the equation.
-12.91666667 + 2x + 12.91666667 + x2 = 0 + 12.91666667

Reorder the terms:
-12.91666667 + 12.91666667 + 2x + x2 = 0 + 12.91666667

Combine like terms: -12.91666667 + 12.91666667 = 0.00000000
0.00000000 + 2x + x2 = 0 + 12.91666667
2x + x2 = 0 + 12.91666667

Combine like terms: 0 + 12.91666667 = 12.91666667
2x + x2 = 12.91666667

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 12.91666667 + 1

Reorder the terms:
1 + 2x + x2 = 12.91666667 + 1

Combine like terms: 12.91666667 + 1 = 13.91666667
1 + 2x + x2 = 13.91666667

Factor a perfect square on the left side:
(x + 1)(x + 1) = 13.91666667

Calculate the square root of the right side: 3.730504881

Break this problem into two subproblems by setting 
(x + 1) equal to 3.730504881 and -3.730504881.

Subproblem 1

x + 1 = 3.730504881 Simplifying x + 1 = 3.730504881 Reorder the terms: 1 + x = 3.730504881 Solving 1 + x = 3.730504881 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 3.730504881 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.730504881 + -1 x = 3.730504881 + -1 Combine like terms: 3.730504881 + -1 = 2.730504881 x = 2.730504881 Simplifying x = 2.730504881

Subproblem 2

x + 1 = -3.730504881 Simplifying x + 1 = -3.730504881 Reorder the terms: 1 + x = -3.730504881 Solving 1 + x = -3.730504881 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -3.730504881 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.730504881 + -1 x = -3.730504881 + -1 Combine like terms: -3.730504881 + -1 = -4.730504881 x = -4.730504881 Simplifying x = -4.730504881

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.730504881, -4.730504881}

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