x(4x-15)=15

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Solution for x(4x-15)=15 equation:


Simplifying
x(4x + -15) = 15

Reorder the terms:
x(-15 + 4x) = 15
(-15 * x + 4x * x) = 15
(-15x + 4x2) = 15

Solving
-15x + 4x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -15x + 4x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -15x + 4x2 = 0

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

Divide each side by '4'.
-3.75 + -3.75x + x2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -3.75x + 3.75 + x2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -3.75x + x2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -3.75x + x2 = 0 + 3.75
-3.75x + x2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-3.75x + x2 = 3.75

The x term is -3.75x.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75x + 3.515625 + x2 = 3.75 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = 3.75 + 3.515625

Combine like terms: 3.75 + 3.515625 = 7.265625
3.515625 + -3.75x + x2 = 7.265625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 7.265625

Calculate the square root of the right side: 2.695482332

Break this problem into two subproblems by setting 
(x + -1.875) equal to 2.695482332 and -2.695482332.

Subproblem 1

x + -1.875 = 2.695482332 Simplifying x + -1.875 = 2.695482332 Reorder the terms: -1.875 + x = 2.695482332 Solving -1.875 + x = 2.695482332 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 2.695482332 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 2.695482332 + 1.875 x = 2.695482332 + 1.875 Combine like terms: 2.695482332 + 1.875 = 4.570482332 x = 4.570482332 Simplifying x = 4.570482332

Subproblem 2

x + -1.875 = -2.695482332 Simplifying x + -1.875 = -2.695482332 Reorder the terms: -1.875 + x = -2.695482332 Solving -1.875 + x = -2.695482332 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -2.695482332 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -2.695482332 + 1.875 x = -2.695482332 + 1.875 Combine like terms: -2.695482332 + 1.875 = -0.820482332 x = -0.820482332 Simplifying x = -0.820482332

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.570482332, -0.820482332}

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