(u+3)(u+3)+7=97

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Solution for (u+3)(u+3)+7=97 equation:


Simplifying
(u + 3)(u + 3) + 7 = 97

Reorder the terms:
(3 + u)(u + 3) + 7 = 97

Reorder the terms:
(3 + u)(3 + u) + 7 = 97

Multiply (3 + u) * (3 + u)
(3(3 + u) + u(3 + u)) + 7 = 97
((3 * 3 + u * 3) + u(3 + u)) + 7 = 97
((9 + 3u) + u(3 + u)) + 7 = 97
(9 + 3u + (3 * u + u * u)) + 7 = 97
(9 + 3u + (3u + u2)) + 7 = 97

Combine like terms: 3u + 3u = 6u
(9 + 6u + u2) + 7 = 97

Reorder the terms:
9 + 7 + 6u + u2 = 97

Combine like terms: 9 + 7 = 16
16 + 6u + u2 = 97

Solving
16 + 6u + u2 = 97

Solving for variable 'u'.

Reorder the terms:
16 + -97 + 6u + u2 = 97 + -97

Combine like terms: 16 + -97 = -81
-81 + 6u + u2 = 97 + -97

Combine like terms: 97 + -97 = 0
-81 + 6u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '81' to each side of the equation.
-81 + 6u + 81 + u2 = 0 + 81

Reorder the terms:
-81 + 81 + 6u + u2 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + 6u + u2 = 0 + 81
6u + u2 = 0 + 81

Combine like terms: 0 + 81 = 81
6u + u2 = 81

The u term is 6u.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6u + 9 + u2 = 81 + 9

Reorder the terms:
9 + 6u + u2 = 81 + 9

Combine like terms: 81 + 9 = 90
9 + 6u + u2 = 90

Factor a perfect square on the left side:
(u + 3)(u + 3) = 90

Calculate the square root of the right side: 9.486832981

Break this problem into two subproblems by setting 
(u + 3) equal to 9.486832981 and -9.486832981.

Subproblem 1

u + 3 = 9.486832981 Simplifying u + 3 = 9.486832981 Reorder the terms: 3 + u = 9.486832981 Solving 3 + u = 9.486832981 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + u = 9.486832981 + -3 Combine like terms: 3 + -3 = 0 0 + u = 9.486832981 + -3 u = 9.486832981 + -3 Combine like terms: 9.486832981 + -3 = 6.486832981 u = 6.486832981 Simplifying u = 6.486832981

Subproblem 2

u + 3 = -9.486832981 Simplifying u + 3 = -9.486832981 Reorder the terms: 3 + u = -9.486832981 Solving 3 + u = -9.486832981 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + u = -9.486832981 + -3 Combine like terms: 3 + -3 = 0 0 + u = -9.486832981 + -3 u = -9.486832981 + -3 Combine like terms: -9.486832981 + -3 = -12.486832981 u = -12.486832981 Simplifying u = -12.486832981

Solution

The solution to the problem is based on the solutions from the subproblems. u = {6.486832981, -12.486832981}

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