3(2x-7)(5x+12)=-14

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Solution for 3(2x-7)(5x+12)=-14 equation:


Simplifying
3(2x + -7)(5x + 12) = -14

Reorder the terms:
3(-7 + 2x)(5x + 12) = -14

Reorder the terms:
3(-7 + 2x)(12 + 5x) = -14

Multiply (-7 + 2x) * (12 + 5x)
3(-7(12 + 5x) + 2x * (12 + 5x)) = -14
3((12 * -7 + 5x * -7) + 2x * (12 + 5x)) = -14
3((-84 + -35x) + 2x * (12 + 5x)) = -14
3(-84 + -35x + (12 * 2x + 5x * 2x)) = -14
3(-84 + -35x + (24x + 10x2)) = -14

Combine like terms: -35x + 24x = -11x
3(-84 + -11x + 10x2) = -14
(-84 * 3 + -11x * 3 + 10x2 * 3) = -14
(-252 + -33x + 30x2) = -14

Solving
-252 + -33x + 30x2 = -14

Solving for variable 'x'.

Reorder the terms:
-252 + 14 + -33x + 30x2 = -14 + 14

Combine like terms: -252 + 14 = -238
-238 + -33x + 30x2 = -14 + 14

Combine like terms: -14 + 14 = 0
-238 + -33x + 30x2 = 0

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

Divide each side by '30'.
-7.933333333 + -1.1x + x2 = 0.0

Move the constant term to the right:

Add '7.933333333' to each side of the equation.
-7.933333333 + -1.1x + 7.933333333 + x2 = 0.0 + 7.933333333

Reorder the terms:
-7.933333333 + 7.933333333 + -1.1x + x2 = 0.0 + 7.933333333

Combine like terms: -7.933333333 + 7.933333333 = 0.000000000
0.000000000 + -1.1x + x2 = 0.0 + 7.933333333
-1.1x + x2 = 0.0 + 7.933333333

Combine like terms: 0.0 + 7.933333333 = 7.933333333
-1.1x + x2 = 7.933333333

The x term is -1.1x.  Take half its coefficient (-0.55).
Square it (0.3025) and add it to both sides.

Add '0.3025' to each side of the equation.
-1.1x + 0.3025 + x2 = 7.933333333 + 0.3025

Reorder the terms:
0.3025 + -1.1x + x2 = 7.933333333 + 0.3025

Combine like terms: 7.933333333 + 0.3025 = 8.235833333
0.3025 + -1.1x + x2 = 8.235833333

Factor a perfect square on the left side:
(x + -0.55)(x + -0.55) = 8.235833333

Calculate the square root of the right side: 2.869814163

Break this problem into two subproblems by setting 
(x + -0.55) equal to 2.869814163 and -2.869814163.

Subproblem 1

x + -0.55 = 2.869814163 Simplifying x + -0.55 = 2.869814163 Reorder the terms: -0.55 + x = 2.869814163 Solving -0.55 + x = 2.869814163 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.55' to each side of the equation. -0.55 + 0.55 + x = 2.869814163 + 0.55 Combine like terms: -0.55 + 0.55 = 0.00 0.00 + x = 2.869814163 + 0.55 x = 2.869814163 + 0.55 Combine like terms: 2.869814163 + 0.55 = 3.419814163 x = 3.419814163 Simplifying x = 3.419814163

Subproblem 2

x + -0.55 = -2.869814163 Simplifying x + -0.55 = -2.869814163 Reorder the terms: -0.55 + x = -2.869814163 Solving -0.55 + x = -2.869814163 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.55' to each side of the equation. -0.55 + 0.55 + x = -2.869814163 + 0.55 Combine like terms: -0.55 + 0.55 = 0.00 0.00 + x = -2.869814163 + 0.55 x = -2.869814163 + 0.55 Combine like terms: -2.869814163 + 0.55 = -2.319814163 x = -2.319814163 Simplifying x = -2.319814163

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.419814163, -2.319814163}

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