(1200+40X)(0.40-0.01X)=0

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Solution for (1200+40X)(0.40-0.01X)=0 equation:


Simplifying
(1200 + 40X)(0.40 + -0.01X) = 0

Multiply (1200 + 40X) * (0.40 + -0.01X)
(1200(0.40 + -0.01X) + 40X * (0.40 + -0.01X)) = 0
((0.40 * 1200 + -0.01X * 1200) + 40X * (0.40 + -0.01X)) = 0
((480 + -12X) + 40X * (0.40 + -0.01X)) = 0
(480 + -12X + (0.40 * 40X + -0.01X * 40X)) = 0
(480 + -12X + (16X + -0.4X2)) = 0

Combine like terms: -12X + 16X = 4X
(480 + 4X + -0.4X2) = 0

Solving
480 + 4X + -0.4X2 = 0

Solving for variable 'X'.

Begin completing the square.  Divide all terms by
-0.4 the coefficient of the squared term: 

Divide each side by '-0.4'.
-1200 + -10X + X2 = 0

Move the constant term to the right:

Add '1200' to each side of the equation.
-1200 + -10X + 1200 + X2 = 0 + 1200

Reorder the terms:
-1200 + 1200 + -10X + X2 = 0 + 1200

Combine like terms: -1200 + 1200 = 0
0 + -10X + X2 = 0 + 1200
-10X + X2 = 0 + 1200

Combine like terms: 0 + 1200 = 1200
-10X + X2 = 1200

The X term is -10X.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10X + 25 + X2 = 1200 + 25

Reorder the terms:
25 + -10X + X2 = 1200 + 25

Combine like terms: 1200 + 25 = 1225
25 + -10X + X2 = 1225

Factor a perfect square on the left side:
(X + -5)(X + -5) = 1225

Calculate the square root of the right side: 35

Break this problem into two subproblems by setting 
(X + -5) equal to 35 and -35.

Subproblem 1

X + -5 = 35 Simplifying X + -5 = 35 Reorder the terms: -5 + X = 35 Solving -5 + X = 35 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + X = 35 + 5 Combine like terms: -5 + 5 = 0 0 + X = 35 + 5 X = 35 + 5 Combine like terms: 35 + 5 = 40 X = 40 Simplifying X = 40

Subproblem 2

X + -5 = -35 Simplifying X + -5 = -35 Reorder the terms: -5 + X = -35 Solving -5 + X = -35 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + X = -35 + 5 Combine like terms: -5 + 5 = 0 0 + X = -35 + 5 X = -35 + 5 Combine like terms: -35 + 5 = -30 X = -30 Simplifying X = -30

Solution

The solution to the problem is based on the solutions from the subproblems. X = {40, -30}

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