(x+3)(x-4)=99

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Solution for (x+3)(x-4)=99 equation:


Simplifying
(x + 3)(x + -4) = 99

Reorder the terms:
(3 + x)(x + -4) = 99

Reorder the terms:
(3 + x)(-4 + x) = 99

Multiply (3 + x) * (-4 + x)
(3(-4 + x) + x(-4 + x)) = 99
((-4 * 3 + x * 3) + x(-4 + x)) = 99
((-12 + 3x) + x(-4 + x)) = 99
(-12 + 3x + (-4 * x + x * x)) = 99
(-12 + 3x + (-4x + x2)) = 99

Combine like terms: 3x + -4x = -1x
(-12 + -1x + x2) = 99

Solving
-12 + -1x + x2 = 99

Solving for variable 'x'.

Reorder the terms:
-12 + -99 + -1x + x2 = 99 + -99

Combine like terms: -12 + -99 = -111
-111 + -1x + x2 = 99 + -99

Combine like terms: 99 + -99 = 0
-111 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '111' to each side of the equation.
-111 + -1x + 111 + x2 = 0 + 111

Reorder the terms:
-111 + 111 + -1x + x2 = 0 + 111

Combine like terms: -111 + 111 = 0
0 + -1x + x2 = 0 + 111
-1x + x2 = 0 + 111

Combine like terms: 0 + 111 = 111
-1x + x2 = 111

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.
-1x + 0.25 + x2 = 111 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 111 + 0.25

Combine like terms: 111 + 0.25 = 111.25
0.25 + -1x + x2 = 111.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 111.25

Calculate the square root of the right side: 10.547511555

Break this problem into two subproblems by setting 
(x + -0.5) equal to 10.547511555 and -10.547511555.

Subproblem 1

x + -0.5 = 10.547511555 Simplifying x + -0.5 = 10.547511555 Reorder the terms: -0.5 + x = 10.547511555 Solving -0.5 + x = 10.547511555 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 = 10.547511555 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 10.547511555 + 0.5 x = 10.547511555 + 0.5 Combine like terms: 10.547511555 + 0.5 = 11.047511555 x = 11.047511555 Simplifying x = 11.047511555

Subproblem 2

x + -0.5 = -10.547511555 Simplifying x + -0.5 = -10.547511555 Reorder the terms: -0.5 + x = -10.547511555 Solving -0.5 + x = -10.547511555 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 = -10.547511555 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -10.547511555 + 0.5 x = -10.547511555 + 0.5 Combine like terms: -10.547511555 + 0.5 = -10.047511555 x = -10.047511555 Simplifying x = -10.047511555

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.047511555, -10.047511555}

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