(14-0.8x)(5-0.5x)=0

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Solution for (14-0.8x)(5-0.5x)=0 equation:


Simplifying
(14 + -0.8x)(5 + -0.5x) = 0

Multiply (14 + -0.8x) * (5 + -0.5x)
(14(5 + -0.5x) + -0.8x * (5 + -0.5x)) = 0
((5 * 14 + -0.5x * 14) + -0.8x * (5 + -0.5x)) = 0
((70 + -7x) + -0.8x * (5 + -0.5x)) = 0
(70 + -7x + (5 * -0.8x + -0.5x * -0.8x)) = 0
(70 + -7x + (-4x + 0.4x2)) = 0

Combine like terms: -7x + -4x = -11x
(70 + -11x + 0.4x2) = 0

Solving
70 + -11x + 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'.
175 + -27.5x + x2 = 0

Move the constant term to the right:

Add '-175' to each side of the equation.
175 + -27.5x + -175 + x2 = 0 + -175

Reorder the terms:
175 + -175 + -27.5x + x2 = 0 + -175

Combine like terms: 175 + -175 = 0
0 + -27.5x + x2 = 0 + -175
-27.5x + x2 = 0 + -175

Combine like terms: 0 + -175 = -175
-27.5x + x2 = -175

The x term is -27.5x.  Take half its coefficient (-13.75).
Square it (189.0625) and add it to both sides.

Add '189.0625' to each side of the equation.
-27.5x + 189.0625 + x2 = -175 + 189.0625

Reorder the terms:
189.0625 + -27.5x + x2 = -175 + 189.0625

Combine like terms: -175 + 189.0625 = 14.0625
189.0625 + -27.5x + x2 = 14.0625

Factor a perfect square on the left side:
(x + -13.75)(x + -13.75) = 14.0625

Calculate the square root of the right side: 3.75

Break this problem into two subproblems by setting 
(x + -13.75) equal to 3.75 and -3.75.

Subproblem 1

x + -13.75 = 3.75 Simplifying x + -13.75 = 3.75 Reorder the terms: -13.75 + x = 3.75 Solving -13.75 + x = 3.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13.75' to each side of the equation. -13.75 + 13.75 + x = 3.75 + 13.75 Combine like terms: -13.75 + 13.75 = 0.00 0.00 + x = 3.75 + 13.75 x = 3.75 + 13.75 Combine like terms: 3.75 + 13.75 = 17.5 x = 17.5 Simplifying x = 17.5

Subproblem 2

x + -13.75 = -3.75 Simplifying x + -13.75 = -3.75 Reorder the terms: -13.75 + x = -3.75 Solving -13.75 + x = -3.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13.75' to each side of the equation. -13.75 + 13.75 + x = -3.75 + 13.75 Combine like terms: -13.75 + 13.75 = 0.00 0.00 + x = -3.75 + 13.75 x = -3.75 + 13.75 Combine like terms: -3.75 + 13.75 = 10 x = 10 Simplifying x = 10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.5, 10}

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