(3x-14)(2x+9)=90

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Solution for (3x-14)(2x+9)=90 equation:


Simplifying
(3x + -14)(2x + 9) = 90

Reorder the terms:
(-14 + 3x)(2x + 9) = 90

Reorder the terms:
(-14 + 3x)(9 + 2x) = 90

Multiply (-14 + 3x) * (9 + 2x)
(-14(9 + 2x) + 3x * (9 + 2x)) = 90
((9 * -14 + 2x * -14) + 3x * (9 + 2x)) = 90
((-126 + -28x) + 3x * (9 + 2x)) = 90
(-126 + -28x + (9 * 3x + 2x * 3x)) = 90
(-126 + -28x + (27x + 6x2)) = 90

Combine like terms: -28x + 27x = -1x
(-126 + -1x + 6x2) = 90

Solving
-126 + -1x + 6x2 = 90

Solving for variable 'x'.

Reorder the terms:
-126 + -90 + -1x + 6x2 = 90 + -90

Combine like terms: -126 + -90 = -216
-216 + -1x + 6x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-216 + -1x + 6x2 = 0

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

Divide each side by '6'.
-36 + -0.1666666667x + x2 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -0.1666666667x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + -0.1666666667x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -0.1666666667x + x2 = 0 + 36
-0.1666666667x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
-0.1666666667x + x2 = 36

The x term is -0.1666666667x.  Take half its coefficient (-0.08333333335).
Square it (0.006944444447) and add it to both sides.

Add '0.006944444447' to each side of the equation.
-0.1666666667x + 0.006944444447 + x2 = 36 + 0.006944444447

Reorder the terms:
0.006944444447 + -0.1666666667x + x2 = 36 + 0.006944444447

Combine like terms: 36 + 0.006944444447 = 36.006944444447
0.006944444447 + -0.1666666667x + x2 = 36.006944444447

Factor a perfect square on the left side:
(x + -0.08333333335)(x + -0.08333333335) = 36.006944444447

Calculate the square root of the right side: 6.000578676

Break this problem into two subproblems by setting 
(x + -0.08333333335) equal to 6.000578676 and -6.000578676.

Subproblem 1

x + -0.08333333335 = 6.000578676 Simplifying x + -0.08333333335 = 6.000578676 Reorder the terms: -0.08333333335 + x = 6.000578676 Solving -0.08333333335 + x = 6.000578676 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.08333333335' to each side of the equation. -0.08333333335 + 0.08333333335 + x = 6.000578676 + 0.08333333335 Combine like terms: -0.08333333335 + 0.08333333335 = 0.00000000000 0.00000000000 + x = 6.000578676 + 0.08333333335 x = 6.000578676 + 0.08333333335 Combine like terms: 6.000578676 + 0.08333333335 = 6.08391200935 x = 6.08391200935 Simplifying x = 6.08391200935

Subproblem 2

x + -0.08333333335 = -6.000578676 Simplifying x + -0.08333333335 = -6.000578676 Reorder the terms: -0.08333333335 + x = -6.000578676 Solving -0.08333333335 + x = -6.000578676 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.08333333335' to each side of the equation. -0.08333333335 + 0.08333333335 + x = -6.000578676 + 0.08333333335 Combine like terms: -0.08333333335 + 0.08333333335 = 0.00000000000 0.00000000000 + x = -6.000578676 + 0.08333333335 x = -6.000578676 + 0.08333333335 Combine like terms: -6.000578676 + 0.08333333335 = -5.91724534265 x = -5.91724534265 Simplifying x = -5.91724534265

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.08391200935, -5.91724534265}

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