(x+4)(5x+-1)=16

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Solution for (x+4)(5x+-1)=16 equation:


Simplifying
(x + 4)(5x + -1) = 16

Reorder the terms:
(4 + x)(5x + -1) = 16

Reorder the terms:
(4 + x)(-1 + 5x) = 16

Multiply (4 + x) * (-1 + 5x)
(4(-1 + 5x) + x(-1 + 5x)) = 16
((-1 * 4 + 5x * 4) + x(-1 + 5x)) = 16
((-4 + 20x) + x(-1 + 5x)) = 16
(-4 + 20x + (-1 * x + 5x * x)) = 16
(-4 + 20x + (-1x + 5x2)) = 16

Combine like terms: 20x + -1x = 19x
(-4 + 19x + 5x2) = 16

Solving
-4 + 19x + 5x2 = 16

Solving for variable 'x'.

Reorder the terms:
-4 + -16 + 19x + 5x2 = 16 + -16

Combine like terms: -4 + -16 = -20
-20 + 19x + 5x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-20 + 19x + 5x2 = 0

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

Divide each side by '5'.
-4 + 3.8x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 3.8x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 3.8x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 3.8x + x2 = 0 + 4
3.8x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
3.8x + x2 = 4

The x term is 3.8x.  Take half its coefficient (1.9).
Square it (3.61) and add it to both sides.

Add '3.61' to each side of the equation.
3.8x + 3.61 + x2 = 4 + 3.61

Reorder the terms:
3.61 + 3.8x + x2 = 4 + 3.61

Combine like terms: 4 + 3.61 = 7.61
3.61 + 3.8x + x2 = 7.61

Factor a perfect square on the left side:
(x + 1.9)(x + 1.9) = 7.61

Calculate the square root of the right side: 2.758622845

Break this problem into two subproblems by setting 
(x + 1.9) equal to 2.758622845 and -2.758622845.

Subproblem 1

x + 1.9 = 2.758622845 Simplifying x + 1.9 = 2.758622845 Reorder the terms: 1.9 + x = 2.758622845 Solving 1.9 + x = 2.758622845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = 2.758622845 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = 2.758622845 + -1.9 x = 2.758622845 + -1.9 Combine like terms: 2.758622845 + -1.9 = 0.858622845 x = 0.858622845 Simplifying x = 0.858622845

Subproblem 2

x + 1.9 = -2.758622845 Simplifying x + 1.9 = -2.758622845 Reorder the terms: 1.9 + x = -2.758622845 Solving 1.9 + x = -2.758622845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = -2.758622845 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = -2.758622845 + -1.9 x = -2.758622845 + -1.9 Combine like terms: -2.758622845 + -1.9 = -4.658622845 x = -4.658622845 Simplifying x = -4.658622845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.858622845, -4.658622845}

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