8x(-10+-4x)=7x-16

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Solution for 8x(-10+-4x)=7x-16 equation:


Simplifying
8x(-10 + -4x) = 7x + -16
(-10 * 8x + -4x * 8x) = 7x + -16
(-80x + -32x2) = 7x + -16

Reorder the terms:
-80x + -32x2 = -16 + 7x

Solving
-80x + -32x2 = -16 + 7x

Solving for variable 'x'.

Reorder the terms:
16 + -80x + -7x + -32x2 = -16 + 7x + 16 + -7x

Combine like terms: -80x + -7x = -87x
16 + -87x + -32x2 = -16 + 7x + 16 + -7x

Reorder the terms:
16 + -87x + -32x2 = -16 + 16 + 7x + -7x

Combine like terms: -16 + 16 = 0
16 + -87x + -32x2 = 0 + 7x + -7x
16 + -87x + -32x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
16 + -87x + -32x2 = 0

Begin completing the square.  Divide all terms by
-32 the coefficient of the squared term: 

Divide each side by '-32'.
-0.5 + 2.71875x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 2.71875x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 2.71875x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 2.71875x + x2 = 0 + 0.5
2.71875x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
2.71875x + x2 = 0.5

The x term is 2.71875x.  Take half its coefficient (1.359375).
Square it (1.847900391) and add it to both sides.

Add '1.847900391' to each side of the equation.
2.71875x + 1.847900391 + x2 = 0.5 + 1.847900391

Reorder the terms:
1.847900391 + 2.71875x + x2 = 0.5 + 1.847900391

Combine like terms: 0.5 + 1.847900391 = 2.347900391
1.847900391 + 2.71875x + x2 = 2.347900391

Factor a perfect square on the left side:
(x + 1.359375)(x + 1.359375) = 2.347900391

Calculate the square root of the right side: 1.532286002

Break this problem into two subproblems by setting 
(x + 1.359375) equal to 1.532286002 and -1.532286002.

Subproblem 1

x + 1.359375 = 1.532286002 Simplifying x + 1.359375 = 1.532286002 Reorder the terms: 1.359375 + x = 1.532286002 Solving 1.359375 + x = 1.532286002 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.359375' to each side of the equation. 1.359375 + -1.359375 + x = 1.532286002 + -1.359375 Combine like terms: 1.359375 + -1.359375 = 0.000000 0.000000 + x = 1.532286002 + -1.359375 x = 1.532286002 + -1.359375 Combine like terms: 1.532286002 + -1.359375 = 0.172911002 x = 0.172911002 Simplifying x = 0.172911002

Subproblem 2

x + 1.359375 = -1.532286002 Simplifying x + 1.359375 = -1.532286002 Reorder the terms: 1.359375 + x = -1.532286002 Solving 1.359375 + x = -1.532286002 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.359375' to each side of the equation. 1.359375 + -1.359375 + x = -1.532286002 + -1.359375 Combine like terms: 1.359375 + -1.359375 = 0.000000 0.000000 + x = -1.532286002 + -1.359375 x = -1.532286002 + -1.359375 Combine like terms: -1.532286002 + -1.359375 = -2.891661002 x = -2.891661002 Simplifying x = -2.891661002

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.172911002, -2.891661002}

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