(u+4)(u+4)=2u^2-10u+8

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Solution for (u+4)(u+4)=2u^2-10u+8 equation:


Simplifying
(u + 4)(u + 4) = 2u2 + -10u + 8

Reorder the terms:
(4 + u)(u + 4) = 2u2 + -10u + 8

Reorder the terms:
(4 + u)(4 + u) = 2u2 + -10u + 8

Multiply (4 + u) * (4 + u)
(4(4 + u) + u(4 + u)) = 2u2 + -10u + 8
((4 * 4 + u * 4) + u(4 + u)) = 2u2 + -10u + 8
((16 + 4u) + u(4 + u)) = 2u2 + -10u + 8
(16 + 4u + (4 * u + u * u)) = 2u2 + -10u + 8
(16 + 4u + (4u + u2)) = 2u2 + -10u + 8

Combine like terms: 4u + 4u = 8u
(16 + 8u + u2) = 2u2 + -10u + 8

Reorder the terms:
16 + 8u + u2 = 8 + -10u + 2u2

Solving
16 + 8u + u2 = 8 + -10u + 2u2

Solving for variable 'u'.

Reorder the terms:
16 + -8 + 8u + 10u + u2 + -2u2 = 8 + -10u + 2u2 + -8 + 10u + -2u2

Combine like terms: 16 + -8 = 8
8 + 8u + 10u + u2 + -2u2 = 8 + -10u + 2u2 + -8 + 10u + -2u2

Combine like terms: 8u + 10u = 18u
8 + 18u + u2 + -2u2 = 8 + -10u + 2u2 + -8 + 10u + -2u2

Combine like terms: u2 + -2u2 = -1u2
8 + 18u + -1u2 = 8 + -10u + 2u2 + -8 + 10u + -2u2

Reorder the terms:
8 + 18u + -1u2 = 8 + -8 + -10u + 10u + 2u2 + -2u2

Combine like terms: 8 + -8 = 0
8 + 18u + -1u2 = 0 + -10u + 10u + 2u2 + -2u2
8 + 18u + -1u2 = -10u + 10u + 2u2 + -2u2

Combine like terms: -10u + 10u = 0
8 + 18u + -1u2 = 0 + 2u2 + -2u2
8 + 18u + -1u2 = 2u2 + -2u2

Combine like terms: 2u2 + -2u2 = 0
8 + 18u + -1u2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-8 + -18u + u2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -18u + 8 + u2 = 0 + 8

Reorder the terms:
-8 + 8 + -18u + u2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -18u + u2 = 0 + 8
-18u + u2 = 0 + 8

Combine like terms: 0 + 8 = 8
-18u + u2 = 8

The u term is -18u.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18u + 81 + u2 = 8 + 81

Reorder the terms:
81 + -18u + u2 = 8 + 81

Combine like terms: 8 + 81 = 89
81 + -18u + u2 = 89

Factor a perfect square on the left side:
(u + -9)(u + -9) = 89

Calculate the square root of the right side: 9.433981132

Break this problem into two subproblems by setting 
(u + -9) equal to 9.433981132 and -9.433981132.

Subproblem 1

u + -9 = 9.433981132 Simplifying u + -9 = 9.433981132 Reorder the terms: -9 + u = 9.433981132 Solving -9 + u = 9.433981132 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + u = 9.433981132 + 9 Combine like terms: -9 + 9 = 0 0 + u = 9.433981132 + 9 u = 9.433981132 + 9 Combine like terms: 9.433981132 + 9 = 18.433981132 u = 18.433981132 Simplifying u = 18.433981132

Subproblem 2

u + -9 = -9.433981132 Simplifying u + -9 = -9.433981132 Reorder the terms: -9 + u = -9.433981132 Solving -9 + u = -9.433981132 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + u = -9.433981132 + 9 Combine like terms: -9 + 9 = 0 0 + u = -9.433981132 + 9 u = -9.433981132 + 9 Combine like terms: -9.433981132 + 9 = -0.433981132 u = -0.433981132 Simplifying u = -0.433981132

Solution

The solution to the problem is based on the solutions from the subproblems. u = {18.433981132, -0.433981132}

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