(x-7)(x+4)=2(x-1)+4

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Solution for (x-7)(x+4)=2(x-1)+4 equation:


Simplifying
(x + -7)(x + 4) = 2(x + -1) + 4

Reorder the terms:
(-7 + x)(x + 4) = 2(x + -1) + 4

Reorder the terms:
(-7 + x)(4 + x) = 2(x + -1) + 4

Multiply (-7 + x) * (4 + x)
(-7(4 + x) + x(4 + x)) = 2(x + -1) + 4
((4 * -7 + x * -7) + x(4 + x)) = 2(x + -1) + 4
((-28 + -7x) + x(4 + x)) = 2(x + -1) + 4
(-28 + -7x + (4 * x + x * x)) = 2(x + -1) + 4
(-28 + -7x + (4x + x2)) = 2(x + -1) + 4

Combine like terms: -7x + 4x = -3x
(-28 + -3x + x2) = 2(x + -1) + 4

Reorder the terms:
-28 + -3x + x2 = 2(-1 + x) + 4
-28 + -3x + x2 = (-1 * 2 + x * 2) + 4
-28 + -3x + x2 = (-2 + 2x) + 4

Reorder the terms:
-28 + -3x + x2 = -2 + 4 + 2x

Combine like terms: -2 + 4 = 2
-28 + -3x + x2 = 2 + 2x

Solving
-28 + -3x + x2 = 2 + 2x

Solving for variable 'x'.

Reorder the terms:
-28 + -2 + -3x + -2x + x2 = 2 + 2x + -2 + -2x

Combine like terms: -28 + -2 = -30
-30 + -3x + -2x + x2 = 2 + 2x + -2 + -2x

Combine like terms: -3x + -2x = -5x
-30 + -5x + x2 = 2 + 2x + -2 + -2x

Reorder the terms:
-30 + -5x + x2 = 2 + -2 + 2x + -2x

Combine like terms: 2 + -2 = 0
-30 + -5x + x2 = 0 + 2x + -2x
-30 + -5x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-30 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -5x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + -5x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -5x + x2 = 0 + 30
-5x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
-5x + x2 = 30

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 30 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 30 + 6.25

Combine like terms: 30 + 6.25 = 36.25
6.25 + -5x + x2 = 36.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(x + -2.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

x + -2.5 = 6.020797289 Simplifying x + -2.5 = 6.020797289 Reorder the terms: -2.5 + x = 6.020797289 Solving -2.5 + x = 6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 6.020797289 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 6.020797289 + 2.5 x = 6.020797289 + 2.5 Combine like terms: 6.020797289 + 2.5 = 8.520797289 x = 8.520797289 Simplifying x = 8.520797289

Subproblem 2

x + -2.5 = -6.020797289 Simplifying x + -2.5 = -6.020797289 Reorder the terms: -2.5 + x = -6.020797289 Solving -2.5 + x = -6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -6.020797289 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -6.020797289 + 2.5 x = -6.020797289 + 2.5 Combine like terms: -6.020797289 + 2.5 = -3.520797289 x = -3.520797289 Simplifying x = -3.520797289

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.520797289, -3.520797289}

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