25d(d-12)=4

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Solution for 25d(d-12)=4 equation:


Simplifying
25d(d + -12) = 4

Reorder the terms:
25d(-12 + d) = 4
(-12 * 25d + d * 25d) = 4
(-300d + 25d2) = 4

Solving
-300d + 25d2 = 4

Solving for variable 'd'.

Reorder the terms:
-4 + -300d + 25d2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + -300d + 25d2 = 0

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

Divide each side by '25'.
-0.16 + -12d + d2 = 0

Move the constant term to the right:

Add '0.16' to each side of the equation.
-0.16 + -12d + 0.16 + d2 = 0 + 0.16

Reorder the terms:
-0.16 + 0.16 + -12d + d2 = 0 + 0.16

Combine like terms: -0.16 + 0.16 = 0.00
0.00 + -12d + d2 = 0 + 0.16
-12d + d2 = 0 + 0.16

Combine like terms: 0 + 0.16 = 0.16
-12d + d2 = 0.16

The d term is -12d.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12d + 36 + d2 = 0.16 + 36

Reorder the terms:
36 + -12d + d2 = 0.16 + 36

Combine like terms: 0.16 + 36 = 36.16
36 + -12d + d2 = 36.16

Factor a perfect square on the left side:
(d + -6)(d + -6) = 36.16

Calculate the square root of the right side: 6.013318551

Break this problem into two subproblems by setting 
(d + -6) equal to 6.013318551 and -6.013318551.

Subproblem 1

d + -6 = 6.013318551 Simplifying d + -6 = 6.013318551 Reorder the terms: -6 + d = 6.013318551 Solving -6 + d = 6.013318551 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + d = 6.013318551 + 6 Combine like terms: -6 + 6 = 0 0 + d = 6.013318551 + 6 d = 6.013318551 + 6 Combine like terms: 6.013318551 + 6 = 12.013318551 d = 12.013318551 Simplifying d = 12.013318551

Subproblem 2

d + -6 = -6.013318551 Simplifying d + -6 = -6.013318551 Reorder the terms: -6 + d = -6.013318551 Solving -6 + d = -6.013318551 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + d = -6.013318551 + 6 Combine like terms: -6 + 6 = 0 0 + d = -6.013318551 + 6 d = -6.013318551 + 6 Combine like terms: -6.013318551 + 6 = -0.013318551 d = -0.013318551 Simplifying d = -0.013318551

Solution

The solution to the problem is based on the solutions from the subproblems. d = {12.013318551, -0.013318551}

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