1-2x(5+x)=7

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Solution for 1-2x(5+x)=7 equation:


Simplifying
1 + -2x(5 + x) = 7
1 + (5 * -2x + x * -2x) = 7
1 + (-10x + -2x2) = 7

Solving
1 + -10x + -2x2 = 7

Solving for variable 'x'.

Reorder the terms:
1 + -7 + -10x + -2x2 = 7 + -7

Combine like terms: 1 + -7 = -6
-6 + -10x + -2x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-6 + -10x + -2x2 = 0

Factor out the Greatest Common Factor (GCF), '-2'.
-2(3 + 5x + x2) = 0

Ignore the factor -2.

Subproblem 1
Set the factor '(3 + 5x + x2)' equal to zero and attempt to solve:

Simplifying
3 + 5x + x2 = 0

Solving
3 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 5x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 5x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 5x + x2 = 0 + -3
5x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
5x + x2 = -3

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 = -3 + 6.25

Reorder the terms:
6.25 + 5x + x2 = -3 + 6.25

Combine like terms: -3 + 6.25 = 3.25
6.25 + 5x + x2 = 3.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(x + 2.5) equal to 1.802775638 and -1.802775638.


Subproblem 1
x + 2.5 = 1.802775638

Simplifying
x + 2.5 = 1.802775638

Reorder the terms:
2.5 + x = 1.802775638

Solving
2.5 + x = 1.802775638

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 = 1.802775638 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = 1.802775638 + -2.5
x = 1.802775638 + -2.5

Combine like terms: 1.802775638 + -2.5 = -0.697224362
x = -0.697224362

Simplifying
x = -0.697224362


Subproblem 2
x + 2.5 = -1.802775638

Simplifying
x + 2.5 = -1.802775638

Reorder the terms:
2.5 + x = -1.802775638

Solving
2.5 + x = -1.802775638

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 = -1.802775638 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = -1.802775638 + -2.5
x = -1.802775638 + -2.5

Combine like terms: -1.802775638 + -2.5 = -4.302775638
x = -4.302775638

Simplifying
x = -4.302775638


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.697224362, -4.302775638}
Solution
x = {-0.697224362, -4.302775638}

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