d^2+7d=10

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Solution for d^2+7d=10 equation:


Simplifying
d2 + 7d = 10

Reorder the terms:
7d + d2 = 10

Solving
7d + d2 = 10

Solving for variable 'd'.

Reorder the terms:
-10 + 7d + d2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + 7d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 7d + 10 + d2 = 0 + 10

Reorder the terms:
-10 + 10 + 7d + d2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 7d + d2 = 0 + 10
7d + d2 = 0 + 10

Combine like terms: 0 + 10 = 10
7d + d2 = 10

The d term is 7d.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7d + 12.25 + d2 = 10 + 12.25

Reorder the terms:
12.25 + 7d + d2 = 10 + 12.25

Combine like terms: 10 + 12.25 = 22.25
12.25 + 7d + d2 = 22.25

Factor a perfect square on the left side:
(d + 3.5)(d + 3.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(d + 3.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

d + 3.5 = 4.716990566 Simplifying d + 3.5 = 4.716990566 Reorder the terms: 3.5 + d = 4.716990566 Solving 3.5 + d = 4.716990566 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + d = 4.716990566 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + d = 4.716990566 + -3.5 d = 4.716990566 + -3.5 Combine like terms: 4.716990566 + -3.5 = 1.216990566 d = 1.216990566 Simplifying d = 1.216990566

Subproblem 2

d + 3.5 = -4.716990566 Simplifying d + 3.5 = -4.716990566 Reorder the terms: 3.5 + d = -4.716990566 Solving 3.5 + d = -4.716990566 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + d = -4.716990566 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + d = -4.716990566 + -3.5 d = -4.716990566 + -3.5 Combine like terms: -4.716990566 + -3.5 = -8.216990566 d = -8.216990566 Simplifying d = -8.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. d = {1.216990566, -8.216990566}

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