d^2+10d=49

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Solution for d^2+10d=49 equation:


Simplifying
d2 + 10d = 49

Reorder the terms:
10d + d2 = 49

Solving
10d + d2 = 49

Solving for variable 'd'.

Reorder the terms:
-49 + 10d + d2 = 49 + -49

Combine like terms: 49 + -49 = 0
-49 + 10d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + 10d + 49 + d2 = 0 + 49

Reorder the terms:
-49 + 49 + 10d + d2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + 10d + d2 = 0 + 49
10d + d2 = 0 + 49

Combine like terms: 0 + 49 = 49
10d + d2 = 49

The d term is 10d.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10d + 25 + d2 = 49 + 25

Reorder the terms:
25 + 10d + d2 = 49 + 25

Combine like terms: 49 + 25 = 74
25 + 10d + d2 = 74

Factor a perfect square on the left side:
(d + 5)(d + 5) = 74

Calculate the square root of the right side: 8.602325267

Break this problem into two subproblems by setting 
(d + 5) equal to 8.602325267 and -8.602325267.

Subproblem 1

d + 5 = 8.602325267 Simplifying d + 5 = 8.602325267 Reorder the terms: 5 + d = 8.602325267 Solving 5 + d = 8.602325267 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + d = 8.602325267 + -5 Combine like terms: 5 + -5 = 0 0 + d = 8.602325267 + -5 d = 8.602325267 + -5 Combine like terms: 8.602325267 + -5 = 3.602325267 d = 3.602325267 Simplifying d = 3.602325267

Subproblem 2

d + 5 = -8.602325267 Simplifying d + 5 = -8.602325267 Reorder the terms: 5 + d = -8.602325267 Solving 5 + d = -8.602325267 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + d = -8.602325267 + -5 Combine like terms: 5 + -5 = 0 0 + d = -8.602325267 + -5 d = -8.602325267 + -5 Combine like terms: -8.602325267 + -5 = -13.602325267 d = -13.602325267 Simplifying d = -13.602325267

Solution

The solution to the problem is based on the solutions from the subproblems. d = {3.602325267, -13.602325267}

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