5d^2+2d=2

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Solution for 5d^2+2d=2 equation:


Simplifying
5d2 + 2d = 2

Reorder the terms:
2d + 5d2 = 2

Solving
2d + 5d2 = 2

Solving for variable 'd'.

Reorder the terms:
-2 + 2d + 5d2 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + 2d + 5d2 = 0

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

Divide each side by '5'.
-0.4 + 0.4d + d2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 0.4d + 0.4 + d2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 0.4d + d2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 0.4d + d2 = 0 + 0.4
0.4d + d2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
0.4d + d2 = 0.4

The d term is 0.4d.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4d + 0.04 + d2 = 0.4 + 0.04

Reorder the terms:
0.04 + 0.4d + d2 = 0.4 + 0.04

Combine like terms: 0.4 + 0.04 = 0.44
0.04 + 0.4d + d2 = 0.44

Factor a perfect square on the left side:
(d + 0.2)(d + 0.2) = 0.44

Calculate the square root of the right side: 0.663324958

Break this problem into two subproblems by setting 
(d + 0.2) equal to 0.663324958 and -0.663324958.

Subproblem 1

d + 0.2 = 0.663324958 Simplifying d + 0.2 = 0.663324958 Reorder the terms: 0.2 + d = 0.663324958 Solving 0.2 + d = 0.663324958 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + d = 0.663324958 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + d = 0.663324958 + -0.2 d = 0.663324958 + -0.2 Combine like terms: 0.663324958 + -0.2 = 0.463324958 d = 0.463324958 Simplifying d = 0.463324958

Subproblem 2

d + 0.2 = -0.663324958 Simplifying d + 0.2 = -0.663324958 Reorder the terms: 0.2 + d = -0.663324958 Solving 0.2 + d = -0.663324958 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + d = -0.663324958 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + d = -0.663324958 + -0.2 d = -0.663324958 + -0.2 Combine like terms: -0.663324958 + -0.2 = -0.863324958 d = -0.863324958 Simplifying d = -0.863324958

Solution

The solution to the problem is based on the solutions from the subproblems. d = {0.463324958, -0.863324958}

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