(6x-7)(4+3x)-(5)(7)=(5x+78)(28)

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Solution for (6x-7)(4+3x)-(5)(7)=(5x+78)(28) equation:


Simplifying
(6x + -7)(4 + 3x) + -1(5)(7) = (5x + 78)(28)

Reorder the terms:
(-7 + 6x)(4 + 3x) + -1(5)(7) = (5x + 78)(28)

Multiply (-7 + 6x) * (4 + 3x)
(-7(4 + 3x) + 6x * (4 + 3x)) + -1(5)(7) = (5x + 78)(28)
((4 * -7 + 3x * -7) + 6x * (4 + 3x)) + -1(5)(7) = (5x + 78)(28)
((-28 + -21x) + 6x * (4 + 3x)) + -1(5)(7) = (5x + 78)(28)
(-28 + -21x + (4 * 6x + 3x * 6x)) + -1(5)(7) = (5x + 78)(28)
(-28 + -21x + (24x + 18x2)) + -1(5)(7) = (5x + 78)(28)

Combine like terms: -21x + 24x = 3x
(-28 + 3x + 18x2) + -1(5)(7) = (5x + 78)(28)

Multiply -1 * 5
-28 + 3x + 18x2 + -5 * 7 = (5x + 78)(28)

Multiply -5 * 7
-28 + 3x + 18x2 + -35 = (5x + 78)(28)

Reorder the terms:
-28 + -35 + 3x + 18x2 = (5x + 78)(28)

Combine like terms: -28 + -35 = -63
-63 + 3x + 18x2 = (5x + 78)(28)

Reorder the terms:
-63 + 3x + 18x2 = (78 + 5x)(28)

Reorder the terms for easier multiplication:
-63 + 3x + 18x2 = 28(78 + 5x)
-63 + 3x + 18x2 = (78 * 28 + 5x * 28)
-63 + 3x + 18x2 = (2184 + 140x)

Solving
-63 + 3x + 18x2 = 2184 + 140x

Solving for variable 'x'.

Reorder the terms:
-63 + -2184 + 3x + -140x + 18x2 = 2184 + 140x + -2184 + -140x

Combine like terms: -63 + -2184 = -2247
-2247 + 3x + -140x + 18x2 = 2184 + 140x + -2184 + -140x

Combine like terms: 3x + -140x = -137x
-2247 + -137x + 18x2 = 2184 + 140x + -2184 + -140x

Reorder the terms:
-2247 + -137x + 18x2 = 2184 + -2184 + 140x + -140x

Combine like terms: 2184 + -2184 = 0
-2247 + -137x + 18x2 = 0 + 140x + -140x
-2247 + -137x + 18x2 = 140x + -140x

Combine like terms: 140x + -140x = 0
-2247 + -137x + 18x2 = 0

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

Divide each side by '18'.
-124.8333333 + -7.611111111x + x2 = 0

Move the constant term to the right:

Add '124.8333333' to each side of the equation.
-124.8333333 + -7.611111111x + 124.8333333 + x2 = 0 + 124.8333333

Reorder the terms:
-124.8333333 + 124.8333333 + -7.611111111x + x2 = 0 + 124.8333333

Combine like terms: -124.8333333 + 124.8333333 = 0.0000000
0.0000000 + -7.611111111x + x2 = 0 + 124.8333333
-7.611111111x + x2 = 0 + 124.8333333

Combine like terms: 0 + 124.8333333 = 124.8333333
-7.611111111x + x2 = 124.8333333

The x term is -7.611111111x.  Take half its coefficient (-3.805555556).
Square it (14.48225309) and add it to both sides.

Add '14.48225309' to each side of the equation.
-7.611111111x + 14.48225309 + x2 = 124.8333333 + 14.48225309

Reorder the terms:
14.48225309 + -7.611111111x + x2 = 124.8333333 + 14.48225309

Combine like terms: 124.8333333 + 14.48225309 = 139.31558639
14.48225309 + -7.611111111x + x2 = 139.31558639

Factor a perfect square on the left side:
(x + -3.805555556)(x + -3.805555556) = 139.31558639

Calculate the square root of the right side: 11.803202379

Break this problem into two subproblems by setting 
(x + -3.805555556) equal to 11.803202379 and -11.803202379.

Subproblem 1

x + -3.805555556 = 11.803202379 Simplifying x + -3.805555556 = 11.803202379 Reorder the terms: -3.805555556 + x = 11.803202379 Solving -3.805555556 + x = 11.803202379 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.805555556' to each side of the equation. -3.805555556 + 3.805555556 + x = 11.803202379 + 3.805555556 Combine like terms: -3.805555556 + 3.805555556 = 0.000000000 0.000000000 + x = 11.803202379 + 3.805555556 x = 11.803202379 + 3.805555556 Combine like terms: 11.803202379 + 3.805555556 = 15.608757935 x = 15.608757935 Simplifying x = 15.608757935

Subproblem 2

x + -3.805555556 = -11.803202379 Simplifying x + -3.805555556 = -11.803202379 Reorder the terms: -3.805555556 + x = -11.803202379 Solving -3.805555556 + x = -11.803202379 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.805555556' to each side of the equation. -3.805555556 + 3.805555556 + x = -11.803202379 + 3.805555556 Combine like terms: -3.805555556 + 3.805555556 = 0.000000000 0.000000000 + x = -11.803202379 + 3.805555556 x = -11.803202379 + 3.805555556 Combine like terms: -11.803202379 + 3.805555556 = -7.997646823 x = -7.997646823 Simplifying x = -7.997646823

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.608757935, -7.997646823}

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