(2x-6)(x+4)=35

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Solution for (2x-6)(x+4)=35 equation:


Simplifying
(2x + -6)(x + 4) = 35

Reorder the terms:
(-6 + 2x)(x + 4) = 35

Reorder the terms:
(-6 + 2x)(4 + x) = 35

Multiply (-6 + 2x) * (4 + x)
(-6(4 + x) + 2x * (4 + x)) = 35
((4 * -6 + x * -6) + 2x * (4 + x)) = 35
((-24 + -6x) + 2x * (4 + x)) = 35
(-24 + -6x + (4 * 2x + x * 2x)) = 35
(-24 + -6x + (8x + 2x2)) = 35

Combine like terms: -6x + 8x = 2x
(-24 + 2x + 2x2) = 35

Solving
-24 + 2x + 2x2 = 35

Solving for variable 'x'.

Reorder the terms:
-24 + -35 + 2x + 2x2 = 35 + -35

Combine like terms: -24 + -35 = -59
-59 + 2x + 2x2 = 35 + -35

Combine like terms: 35 + -35 = 0
-59 + 2x + 2x2 = 0

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

Divide each side by '2'.
-29.5 + x + x2 = 0

Move the constant term to the right:

Add '29.5' to each side of the equation.
-29.5 + x + 29.5 + x2 = 0 + 29.5

Reorder the terms:
-29.5 + 29.5 + x + x2 = 0 + 29.5

Combine like terms: -29.5 + 29.5 = 0.0
0.0 + x + x2 = 0 + 29.5
x + x2 = 0 + 29.5

Combine like terms: 0 + 29.5 = 29.5
x + x2 = 29.5

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 29.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 29.5 + 0.25

Combine like terms: 29.5 + 0.25 = 29.75
1.25 + x2 = 29.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 29.75

Calculate the square root of the right side: 5.454356057

Break this problem into two subproblems by setting 
(x + 0.5) equal to 5.454356057 and -5.454356057.

Subproblem 1

x + 0.5 = 5.454356057 Simplifying x + 0.5 = 5.454356057 Reorder the terms: 0.5 + x = 5.454356057 Solving 0.5 + x = 5.454356057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 5.454356057 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 5.454356057 + -0.5 x = 5.454356057 + -0.5 Combine like terms: 5.454356057 + -0.5 = 4.954356057 x = 4.954356057 Simplifying x = 4.954356057

Subproblem 2

x + 0.5 = -5.454356057 Simplifying x + 0.5 = -5.454356057 Reorder the terms: 0.5 + x = -5.454356057 Solving 0.5 + x = -5.454356057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -5.454356057 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -5.454356057 + -0.5 x = -5.454356057 + -0.5 Combine like terms: -5.454356057 + -0.5 = -5.954356057 x = -5.954356057 Simplifying x = -5.954356057

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.954356057, -5.954356057}

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