(x+5)(x-4)=56

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Solution for (x+5)(x-4)=56 equation:


Simplifying
(x + 5)(x + -4) = 56

Reorder the terms:
(5 + x)(x + -4) = 56

Reorder the terms:
(5 + x)(-4 + x) = 56

Multiply (5 + x) * (-4 + x)
(5(-4 + x) + x(-4 + x)) = 56
((-4 * 5 + x * 5) + x(-4 + x)) = 56
((-20 + 5x) + x(-4 + x)) = 56
(-20 + 5x + (-4 * x + x * x)) = 56
(-20 + 5x + (-4x + x2)) = 56

Combine like terms: 5x + -4x = 1x
(-20 + 1x + x2) = 56

Solving
-20 + 1x + x2 = 56

Solving for variable 'x'.

Reorder the terms:
-20 + -56 + 1x + x2 = 56 + -56

Combine like terms: -20 + -56 = -76
-76 + 1x + x2 = 56 + -56

Combine like terms: 56 + -56 = 0
-76 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '76' to each side of the equation.
-76 + 1x + 76 + x2 = 0 + 76

Reorder the terms:
-76 + 76 + 1x + x2 = 0 + 76

Combine like terms: -76 + 76 = 0
0 + 1x + x2 = 0 + 76
1x + x2 = 0 + 76

Combine like terms: 0 + 76 = 76
1x + x2 = 76

The x term is 1x.  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.
x + 0.25 + x2 = 76 + 0.25

Reorder the terms:
0.25 + x + x2 = 76 + 0.25

Combine like terms: 76 + 0.25 = 76.25
0.25 + x + x2 = 76.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 76.25

Calculate the square root of the right side: 8.732124598

Break this problem into two subproblems by setting 
(x + 0.5) equal to 8.732124598 and -8.732124598.

Subproblem 1

x + 0.5 = 8.732124598 Simplifying x + 0.5 = 8.732124598 Reorder the terms: 0.5 + x = 8.732124598 Solving 0.5 + x = 8.732124598 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 = 8.732124598 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 8.732124598 + -0.5 x = 8.732124598 + -0.5 Combine like terms: 8.732124598 + -0.5 = 8.232124598 x = 8.232124598 Simplifying x = 8.232124598

Subproblem 2

x + 0.5 = -8.732124598 Simplifying x + 0.5 = -8.732124598 Reorder the terms: 0.5 + x = -8.732124598 Solving 0.5 + x = -8.732124598 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 = -8.732124598 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -8.732124598 + -0.5 x = -8.732124598 + -0.5 Combine like terms: -8.732124598 + -0.5 = -9.232124598 x = -9.232124598 Simplifying x = -9.232124598

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.232124598, -9.232124598}

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