(x+4)(x-16)=6x

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Solution for (x+4)(x-16)=6x equation:


Simplifying
(x + 4)(x + -16) = 6x

Reorder the terms:
(4 + x)(x + -16) = 6x

Reorder the terms:
(4 + x)(-16 + x) = 6x

Multiply (4 + x) * (-16 + x)
(4(-16 + x) + x(-16 + x)) = 6x
((-16 * 4 + x * 4) + x(-16 + x)) = 6x
((-64 + 4x) + x(-16 + x)) = 6x
(-64 + 4x + (-16 * x + x * x)) = 6x
(-64 + 4x + (-16x + x2)) = 6x

Combine like terms: 4x + -16x = -12x
(-64 + -12x + x2) = 6x

Solving
-64 + -12x + x2 = 6x

Solving for variable 'x'.

Reorder the terms:
-64 + -12x + -6x + x2 = 6x + -6x

Combine like terms: -12x + -6x = -18x
-64 + -18x + x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-64 + -18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -18x + 64 + x2 = 0 + 64

Reorder the terms:
-64 + 64 + -18x + x2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -18x + x2 = 0 + 64
-18x + x2 = 0 + 64

Combine like terms: 0 + 64 = 64
-18x + x2 = 64

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 64 + 81

Reorder the terms:
81 + -18x + x2 = 64 + 81

Combine like terms: 64 + 81 = 145
81 + -18x + x2 = 145

Factor a perfect square on the left side:
(x + -9)(x + -9) = 145

Calculate the square root of the right side: 12.041594579

Break this problem into two subproblems by setting 
(x + -9) equal to 12.041594579 and -12.041594579.

Subproblem 1

x + -9 = 12.041594579 Simplifying x + -9 = 12.041594579 Reorder the terms: -9 + x = 12.041594579 Solving -9 + x = 12.041594579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 12.041594579 + 9 Combine like terms: -9 + 9 = 0 0 + x = 12.041594579 + 9 x = 12.041594579 + 9 Combine like terms: 12.041594579 + 9 = 21.041594579 x = 21.041594579 Simplifying x = 21.041594579

Subproblem 2

x + -9 = -12.041594579 Simplifying x + -9 = -12.041594579 Reorder the terms: -9 + x = -12.041594579 Solving -9 + x = -12.041594579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -12.041594579 + 9 Combine like terms: -9 + 9 = 0 0 + x = -12.041594579 + 9 x = -12.041594579 + 9 Combine like terms: -12.041594579 + 9 = -3.041594579 x = -3.041594579 Simplifying x = -3.041594579

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.041594579, -3.041594579}

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