x(10x+3)=75

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Solution for x(10x+3)=75 equation:


Simplifying
x(10x + 3) = 75

Reorder the terms:
x(3 + 10x) = 75
(3 * x + 10x * x) = 75
(3x + 10x2) = 75

Solving
3x + 10x2 = 75

Solving for variable 'x'.

Reorder the terms:
-75 + 3x + 10x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-75 + 3x + 10x2 = 0

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

Divide each side by '10'.
-7.5 + 0.3x + x2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + 0.3x + 7.5 + x2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + 0.3x + x2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + 0.3x + x2 = 0 + 7.5
0.3x + x2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
0.3x + x2 = 7.5

The x term is 0.3x.  Take half its coefficient (0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
0.3x + 0.0225 + x2 = 7.5 + 0.0225

Reorder the terms:
0.0225 + 0.3x + x2 = 7.5 + 0.0225

Combine like terms: 7.5 + 0.0225 = 7.5225
0.0225 + 0.3x + x2 = 7.5225

Factor a perfect square on the left side:
(x + 0.15)(x + 0.15) = 7.5225

Calculate the square root of the right side: 2.74271763

Break this problem into two subproblems by setting 
(x + 0.15) equal to 2.74271763 and -2.74271763.

Subproblem 1

x + 0.15 = 2.74271763 Simplifying x + 0.15 = 2.74271763 Reorder the terms: 0.15 + x = 2.74271763 Solving 0.15 + x = 2.74271763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = 2.74271763 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = 2.74271763 + -0.15 x = 2.74271763 + -0.15 Combine like terms: 2.74271763 + -0.15 = 2.59271763 x = 2.59271763 Simplifying x = 2.59271763

Subproblem 2

x + 0.15 = -2.74271763 Simplifying x + 0.15 = -2.74271763 Reorder the terms: 0.15 + x = -2.74271763 Solving 0.15 + x = -2.74271763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = -2.74271763 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = -2.74271763 + -0.15 x = -2.74271763 + -0.15 Combine like terms: -2.74271763 + -0.15 = -2.89271763 x = -2.89271763 Simplifying x = -2.89271763

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.59271763, -2.89271763}

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