-5x(8-x)=12

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Solution for -5x(8-x)=12 equation:


Simplifying
-5x(8 + -1x) = 12
(8 * -5x + -1x * -5x) = 12
(-40x + 5x2) = 12

Solving
-40x + 5x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + -40x + 5x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + -40x + 5x2 = 0

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

Divide each side by '5'.
-2.4 + -8x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -8x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -8x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -8x + x2 = 0 + 2.4
-8x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-8x + x2 = 2.4

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 2.4 + 16

Reorder the terms:
16 + -8x + x2 = 2.4 + 16

Combine like terms: 2.4 + 16 = 18.4
16 + -8x + x2 = 18.4

Factor a perfect square on the left side:
(x + -4)(x + -4) = 18.4

Calculate the square root of the right side: 4.289522118

Break this problem into two subproblems by setting 
(x + -4) equal to 4.289522118 and -4.289522118.

Subproblem 1

x + -4 = 4.289522118 Simplifying x + -4 = 4.289522118 Reorder the terms: -4 + x = 4.289522118 Solving -4 + x = 4.289522118 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 4.289522118 + 4 Combine like terms: -4 + 4 = 0 0 + x = 4.289522118 + 4 x = 4.289522118 + 4 Combine like terms: 4.289522118 + 4 = 8.289522118 x = 8.289522118 Simplifying x = 8.289522118

Subproblem 2

x + -4 = -4.289522118 Simplifying x + -4 = -4.289522118 Reorder the terms: -4 + x = -4.289522118 Solving -4 + x = -4.289522118 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -4.289522118 + 4 Combine like terms: -4 + 4 = 0 0 + x = -4.289522118 + 4 x = -4.289522118 + 4 Combine like terms: -4.289522118 + 4 = -0.289522118 x = -0.289522118 Simplifying x = -0.289522118

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.289522118, -0.289522118}

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