d^2+d=3

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Solution for d^2+d=3 equation:


Simplifying
d2 + d = 3

Reorder the terms:
d + d2 = 3

Solving
d + d2 = 3

Solving for variable 'd'.

Reorder the terms:
-3 + d + d2 = 3 + -3

Combine like terms: 3 + -3 = 0
-3 + d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + d + 3 + d2 = 0 + 3

Reorder the terms:
-3 + 3 + d + d2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + d + d2 = 0 + 3
d + d2 = 0 + 3

Combine like terms: 0 + 3 = 3
d + d2 = 3

The d term is d.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
d + 0.25 + d2 = 3 + 0.25

Reorder the terms:
0.25 + d + d2 = 3 + 0.25

Combine like terms: 3 + 0.25 = 3.25
0.25 + d + d2 = 3.25

Factor a perfect square on the left side:
(d + 0.5)(d + 0.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(d + 0.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

d + 0.5 = 1.802775638 Simplifying d + 0.5 = 1.802775638 Reorder the terms: 0.5 + d = 1.802775638 Solving 0.5 + d = 1.802775638 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + d = 1.802775638 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + d = 1.802775638 + -0.5 d = 1.802775638 + -0.5 Combine like terms: 1.802775638 + -0.5 = 1.302775638 d = 1.302775638 Simplifying d = 1.302775638

Subproblem 2

d + 0.5 = -1.802775638 Simplifying d + 0.5 = -1.802775638 Reorder the terms: 0.5 + d = -1.802775638 Solving 0.5 + d = -1.802775638 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + d = -1.802775638 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + d = -1.802775638 + -0.5 d = -1.802775638 + -0.5 Combine like terms: -1.802775638 + -0.5 = -2.302775638 d = -2.302775638 Simplifying d = -2.302775638

Solution

The solution to the problem is based on the solutions from the subproblems. d = {1.302775638, -2.302775638}

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