(150+x)(15-0.05x)=0

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Solution for (150+x)(15-0.05x)=0 equation:


Simplifying
(150 + x)(15 + -0.05x) = 0

Multiply (150 + x) * (15 + -0.05x)
(150(15 + -0.05x) + x(15 + -0.05x)) = 0
((15 * 150 + -0.05x * 150) + x(15 + -0.05x)) = 0
((2250 + -7.5x) + x(15 + -0.05x)) = 0
(2250 + -7.5x + (15 * x + -0.05x * x)) = 0
(2250 + -7.5x + (15x + -0.05x2)) = 0

Combine like terms: -7.5x + 15x = 7.5x
(2250 + 7.5x + -0.05x2) = 0

Solving
2250 + 7.5x + -0.05x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.05 the coefficient of the squared term: 

Divide each side by '-0.05'.
-45000 + -150x + x2 = 0

Move the constant term to the right:

Add '45000' to each side of the equation.
-45000 + -150x + 45000 + x2 = 0 + 45000

Reorder the terms:
-45000 + 45000 + -150x + x2 = 0 + 45000

Combine like terms: -45000 + 45000 = 0
0 + -150x + x2 = 0 + 45000
-150x + x2 = 0 + 45000

Combine like terms: 0 + 45000 = 45000
-150x + x2 = 45000

The x term is -150x.  Take half its coefficient (-75).
Square it (5625) and add it to both sides.

Add '5625' to each side of the equation.
-150x + 5625 + x2 = 45000 + 5625

Reorder the terms:
5625 + -150x + x2 = 45000 + 5625

Combine like terms: 45000 + 5625 = 50625
5625 + -150x + x2 = 50625

Factor a perfect square on the left side:
(x + -75)(x + -75) = 50625

Calculate the square root of the right side: 225

Break this problem into two subproblems by setting 
(x + -75) equal to 225 and -225.

Subproblem 1

x + -75 = 225 Simplifying x + -75 = 225 Reorder the terms: -75 + x = 225 Solving -75 + x = 225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '75' to each side of the equation. -75 + 75 + x = 225 + 75 Combine like terms: -75 + 75 = 0 0 + x = 225 + 75 x = 225 + 75 Combine like terms: 225 + 75 = 300 x = 300 Simplifying x = 300

Subproblem 2

x + -75 = -225 Simplifying x + -75 = -225 Reorder the terms: -75 + x = -225 Solving -75 + x = -225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '75' to each side of the equation. -75 + 75 + x = -225 + 75 Combine like terms: -75 + 75 = 0 0 + x = -225 + 75 x = -225 + 75 Combine like terms: -225 + 75 = -150 x = -150 Simplifying x = -150

Solution

The solution to the problem is based on the solutions from the subproblems. x = {300, -150}

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