(2-x)*(x+4)=-4(x-18)

Solution for (2-x)*(x+4)=-4(x-18) equation:

Simplifying
(2 + -1x)(x + 4) = -4(x + -18)

Reorder the terms:
(2 + -1x)(4 + x) = -4(x + -18)

Multiply (2 + -1x) * (4 + x)
(2(4 + x) + -1x * (4 + x)) = -4(x + -18)
((4 * 2 + x * 2) + -1x * (4 + x)) = -4(x + -18)
((8 + 2x) + -1x * (4 + x)) = -4(x + -18)
(8 + 2x + (4 * -1x + x * -1x)) = -4(x + -18)
(8 + 2x + (-4x + -1x2)) = -4(x + -18)

Combine like terms: 2x + -4x = -2x
(8 + -2x + -1x2) = -4(x + -18)

Reorder the terms:
8 + -2x + -1x2 = -4(-18 + x)
8 + -2x + -1x2 = (-18 * -4 + x * -4)
8 + -2x + -1x2 = (72 + -4x)

Solving
8 + -2x + -1x2 = 72 + -4x

Solving for variable 'x'.

Reorder the terms:
8 + -72 + -2x + 4x + -1x2 = 72 + -4x + -72 + 4x

Combine like terms: 8 + -72 = -64
-64 + -2x + 4x + -1x2 = 72 + -4x + -72 + 4x

Combine like terms: -2x + 4x = 2x
-64 + 2x + -1x2 = 72 + -4x + -72 + 4x

Reorder the terms:
-64 + 2x + -1x2 = 72 + -72 + -4x + 4x

Combine like terms: 72 + -72 = 0
-64 + 2x + -1x2 = 0 + -4x + 4x
-64 + 2x + -1x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-64 + 2x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
64 + -2x + x2 = 0

Move the constant term to the right:

Add '-64' to each side of the equation.
64 + -2x + -64 + x2 = 0 + -64

Reorder the terms:
64 + -64 + -2x + x2 = 0 + -64

Combine like terms: 64 + -64 = 0
0 + -2x + x2 = 0 + -64
-2x + x2 = 0 + -64

Combine like terms: 0 + -64 = -64
-2x + x2 = -64

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = -64 + 1

Reorder the terms:
1 + -2x + x2 = -64 + 1

Combine like terms: -64 + 1 = -63
1 + -2x + x2 = -63

Factor a perfect square on the left side:
(x + -1)(x + -1) = -63

Can't calculate square root of the right side.

The solution to this equation could not be determined.