(3x-1)(2x+5)=4x

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Solution for (3x-1)(2x+5)=4x equation:


Simplifying
(3x + -1)(2x + 5) = 4x

Reorder the terms:
(-1 + 3x)(2x + 5) = 4x

Reorder the terms:
(-1 + 3x)(5 + 2x) = 4x

Multiply (-1 + 3x) * (5 + 2x)
(-1(5 + 2x) + 3x * (5 + 2x)) = 4x
((5 * -1 + 2x * -1) + 3x * (5 + 2x)) = 4x
((-5 + -2x) + 3x * (5 + 2x)) = 4x
(-5 + -2x + (5 * 3x + 2x * 3x)) = 4x
(-5 + -2x + (15x + 6x2)) = 4x

Combine like terms: -2x + 15x = 13x
(-5 + 13x + 6x2) = 4x

Solving
-5 + 13x + 6x2 = 4x

Solving for variable 'x'.

Reorder the terms:
-5 + 13x + -4x + 6x2 = 4x + -4x

Combine like terms: 13x + -4x = 9x
-5 + 9x + 6x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-5 + 9x + 6x2 = 0

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

Divide each side by '6'.
-0.8333333333 + 1.5x + x2 = 0

Move the constant term to the right:

Add '0.8333333333' to each side of the equation.
-0.8333333333 + 1.5x + 0.8333333333 + x2 = 0 + 0.8333333333

Reorder the terms:
-0.8333333333 + 0.8333333333 + 1.5x + x2 = 0 + 0.8333333333

Combine like terms: -0.8333333333 + 0.8333333333 = 0.0000000000
0.0000000000 + 1.5x + x2 = 0 + 0.8333333333
1.5x + x2 = 0 + 0.8333333333

Combine like terms: 0 + 0.8333333333 = 0.8333333333
1.5x + x2 = 0.8333333333

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 = 0.8333333333 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 0.8333333333 + 0.5625

Combine like terms: 0.8333333333 + 0.5625 = 1.3958333333
0.5625 + 1.5x + x2 = 1.3958333333

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 1.3958333333

Calculate the square root of the right side: 1.181453907

Break this problem into two subproblems by setting 
(x + 0.75) equal to 1.181453907 and -1.181453907.

Subproblem 1

x + 0.75 = 1.181453907 Simplifying x + 0.75 = 1.181453907 Reorder the terms: 0.75 + x = 1.181453907 Solving 0.75 + x = 1.181453907 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 = 1.181453907 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 1.181453907 + -0.75 x = 1.181453907 + -0.75 Combine like terms: 1.181453907 + -0.75 = 0.431453907 x = 0.431453907 Simplifying x = 0.431453907

Subproblem 2

x + 0.75 = -1.181453907 Simplifying x + 0.75 = -1.181453907 Reorder the terms: 0.75 + x = -1.181453907 Solving 0.75 + x = -1.181453907 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 = -1.181453907 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -1.181453907 + -0.75 x = -1.181453907 + -0.75 Combine like terms: -1.181453907 + -0.75 = -1.931453907 x = -1.931453907 Simplifying x = -1.931453907

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.431453907, -1.931453907}

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