(3x-12)(2x+5)=196

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Solution for (3x-12)(2x+5)=196 equation:


Simplifying
(3x + -12)(2x + 5) = 196

Reorder the terms:
(-12 + 3x)(2x + 5) = 196

Reorder the terms:
(-12 + 3x)(5 + 2x) = 196

Multiply (-12 + 3x) * (5 + 2x)
(-12(5 + 2x) + 3x * (5 + 2x)) = 196
((5 * -12 + 2x * -12) + 3x * (5 + 2x)) = 196
((-60 + -24x) + 3x * (5 + 2x)) = 196
(-60 + -24x + (5 * 3x + 2x * 3x)) = 196
(-60 + -24x + (15x + 6x2)) = 196

Combine like terms: -24x + 15x = -9x
(-60 + -9x + 6x2) = 196

Solving
-60 + -9x + 6x2 = 196

Solving for variable 'x'.

Reorder the terms:
-60 + -196 + -9x + 6x2 = 196 + -196

Combine like terms: -60 + -196 = -256
-256 + -9x + 6x2 = 196 + -196

Combine like terms: 196 + -196 = 0
-256 + -9x + 6x2 = 0

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

Divide each side by '6'.
-42.66666667 + -1.5x + x2 = 0

Move the constant term to the right:

Add '42.66666667' to each side of the equation.
-42.66666667 + -1.5x + 42.66666667 + x2 = 0 + 42.66666667

Reorder the terms:
-42.66666667 + 42.66666667 + -1.5x + x2 = 0 + 42.66666667

Combine like terms: -42.66666667 + 42.66666667 = 0.00000000
0.00000000 + -1.5x + x2 = 0 + 42.66666667
-1.5x + x2 = 0 + 42.66666667

Combine like terms: 0 + 42.66666667 = 42.66666667
-1.5x + x2 = 42.66666667

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 42.66666667 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 42.66666667 + 0.5625

Combine like terms: 42.66666667 + 0.5625 = 43.22916667
0.5625 + -1.5x + x2 = 43.22916667

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 43.22916667

Calculate the square root of the right side: 6.574889099

Break this problem into two subproblems by setting 
(x + -0.75) equal to 6.574889099 and -6.574889099.

Subproblem 1

x + -0.75 = 6.574889099 Simplifying x + -0.75 = 6.574889099 Reorder the terms: -0.75 + x = 6.574889099 Solving -0.75 + x = 6.574889099 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 6.574889099 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 6.574889099 + 0.75 x = 6.574889099 + 0.75 Combine like terms: 6.574889099 + 0.75 = 7.324889099 x = 7.324889099 Simplifying x = 7.324889099

Subproblem 2

x + -0.75 = -6.574889099 Simplifying x + -0.75 = -6.574889099 Reorder the terms: -0.75 + x = -6.574889099 Solving -0.75 + x = -6.574889099 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -6.574889099 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -6.574889099 + 0.75 x = -6.574889099 + 0.75 Combine like terms: -6.574889099 + 0.75 = -5.824889099 x = -5.824889099 Simplifying x = -5.824889099

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.324889099, -5.824889099}

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