1d^2=18d-16

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Solution for 1d^2=18d-16 equation:


Simplifying
1d2 = 18d + -16

Reorder the terms:
1d2 = -16 + 18d

Solving
1d2 = -16 + 18d

Solving for variable 'd'.

Reorder the terms:
16 + -18d + 1d2 = -16 + 18d + 16 + -18d

Reorder the terms:
16 + -18d + 1d2 = -16 + 16 + 18d + -18d

Combine like terms: -16 + 16 = 0
16 + -18d + 1d2 = 0 + 18d + -18d
16 + -18d + 1d2 = 18d + -18d

Combine like terms: 18d + -18d = 0
16 + -18d + 1d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + -18d + -16 + d2 = 0 + -16

Reorder the terms:
16 + -16 + -18d + d2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -18d + d2 = 0 + -16
-18d + d2 = 0 + -16

Combine like terms: 0 + -16 = -16
-18d + d2 = -16

The d term is -18d.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18d + 81 + d2 = -16 + 81

Reorder the terms:
81 + -18d + d2 = -16 + 81

Combine like terms: -16 + 81 = 65
81 + -18d + d2 = 65

Factor a perfect square on the left side:
(d + -9)(d + -9) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(d + -9) equal to 8.062257748 and -8.062257748.

Subproblem 1

d + -9 = 8.062257748 Simplifying d + -9 = 8.062257748 Reorder the terms: -9 + d = 8.062257748 Solving -9 + d = 8.062257748 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + d = 8.062257748 + 9 Combine like terms: -9 + 9 = 0 0 + d = 8.062257748 + 9 d = 8.062257748 + 9 Combine like terms: 8.062257748 + 9 = 17.062257748 d = 17.062257748 Simplifying d = 17.062257748

Subproblem 2

d + -9 = -8.062257748 Simplifying d + -9 = -8.062257748 Reorder the terms: -9 + d = -8.062257748 Solving -9 + d = -8.062257748 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + d = -8.062257748 + 9 Combine like terms: -9 + 9 = 0 0 + d = -8.062257748 + 9 d = -8.062257748 + 9 Combine like terms: -8.062257748 + 9 = 0.937742252 d = 0.937742252 Simplifying d = 0.937742252

Solution

The solution to the problem is based on the solutions from the subproblems. d = {17.062257748, 0.937742252}

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