(x+7)(x-4)=10

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Solution for (x+7)(x-4)=10 equation:


Simplifying
(x + 7)(x + -4) = 10

Reorder the terms:
(7 + x)(x + -4) = 10

Reorder the terms:
(7 + x)(-4 + x) = 10

Multiply (7 + x) * (-4 + x)
(7(-4 + x) + x(-4 + x)) = 10
((-4 * 7 + x * 7) + x(-4 + x)) = 10
((-28 + 7x) + x(-4 + x)) = 10
(-28 + 7x + (-4 * x + x * x)) = 10
(-28 + 7x + (-4x + x2)) = 10

Combine like terms: 7x + -4x = 3x
(-28 + 3x + x2) = 10

Solving
-28 + 3x + x2 = 10

Solving for variable 'x'.

Reorder the terms:
-28 + -10 + 3x + x2 = 10 + -10

Combine like terms: -28 + -10 = -38
-38 + 3x + x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-38 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '38' to each side of the equation.
-38 + 3x + 38 + x2 = 0 + 38

Reorder the terms:
-38 + 38 + 3x + x2 = 0 + 38

Combine like terms: -38 + 38 = 0
0 + 3x + x2 = 0 + 38
3x + x2 = 0 + 38

Combine like terms: 0 + 38 = 38
3x + x2 = 38

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 38 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 38 + 2.25

Combine like terms: 38 + 2.25 = 40.25
2.25 + 3x + x2 = 40.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 40.25

Calculate the square root of the right side: 6.34428877

Break this problem into two subproblems by setting 
(x + 1.5) equal to 6.34428877 and -6.34428877.

Subproblem 1

x + 1.5 = 6.34428877 Simplifying x + 1.5 = 6.34428877 Reorder the terms: 1.5 + x = 6.34428877 Solving 1.5 + x = 6.34428877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 6.34428877 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 6.34428877 + -1.5 x = 6.34428877 + -1.5 Combine like terms: 6.34428877 + -1.5 = 4.84428877 x = 4.84428877 Simplifying x = 4.84428877

Subproblem 2

x + 1.5 = -6.34428877 Simplifying x + 1.5 = -6.34428877 Reorder the terms: 1.5 + x = -6.34428877 Solving 1.5 + x = -6.34428877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -6.34428877 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -6.34428877 + -1.5 x = -6.34428877 + -1.5 Combine like terms: -6.34428877 + -1.5 = -7.84428877 x = -7.84428877 Simplifying x = -7.84428877

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.84428877, -7.84428877}

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