(x-5)(x+2)+4(x-1)=0

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Solution for (x-5)(x+2)+4(x-1)=0 equation:


Simplifying
(x + -5)(x + 2) + 4(x + -1) = 0

Reorder the terms:
(-5 + x)(x + 2) + 4(x + -1) = 0

Reorder the terms:
(-5 + x)(2 + x) + 4(x + -1) = 0

Multiply (-5 + x) * (2 + x)
(-5(2 + x) + x(2 + x)) + 4(x + -1) = 0
((2 * -5 + x * -5) + x(2 + x)) + 4(x + -1) = 0
((-10 + -5x) + x(2 + x)) + 4(x + -1) = 0
(-10 + -5x + (2 * x + x * x)) + 4(x + -1) = 0
(-10 + -5x + (2x + x2)) + 4(x + -1) = 0

Combine like terms: -5x + 2x = -3x
(-10 + -3x + x2) + 4(x + -1) = 0

Reorder the terms:
-10 + -3x + x2 + 4(-1 + x) = 0
-10 + -3x + x2 + (-1 * 4 + x * 4) = 0
-10 + -3x + x2 + (-4 + 4x) = 0

Reorder the terms:
-10 + -4 + -3x + 4x + x2 = 0

Combine like terms: -10 + -4 = -14
-14 + -3x + 4x + x2 = 0

Combine like terms: -3x + 4x = 1x
-14 + 1x + x2 = 0

Solving
-14 + 1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 1x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + 1x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 1x + x2 = 0 + 14
1x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
1x + x2 = 14

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 = 14 + 0.25

Reorder the terms:
0.25 + x + x2 = 14 + 0.25

Combine like terms: 14 + 0.25 = 14.25
0.25 + x + x2 = 14.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

x + 0.5 = 3.774917218 Simplifying x + 0.5 = 3.774917218 Reorder the terms: 0.5 + x = 3.774917218 Solving 0.5 + x = 3.774917218 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 = 3.774917218 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.774917218 + -0.5 x = 3.774917218 + -0.5 Combine like terms: 3.774917218 + -0.5 = 3.274917218 x = 3.274917218 Simplifying x = 3.274917218

Subproblem 2

x + 0.5 = -3.774917218 Simplifying x + 0.5 = -3.774917218 Reorder the terms: 0.5 + x = -3.774917218 Solving 0.5 + x = -3.774917218 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 = -3.774917218 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.774917218 + -0.5 x = -3.774917218 + -0.5 Combine like terms: -3.774917218 + -0.5 = -4.274917218 x = -4.274917218 Simplifying x = -4.274917218

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.274917218, -4.274917218}

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