u^2-7u-12=0

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Solution for u^2-7u-12=0 equation:


Simplifying
u2 + -7u + -12 = 0

Reorder the terms:
-12 + -7u + u2 = 0

Solving
-12 + -7u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -7u + 12 + u2 = 0 + 12

Reorder the terms:
-12 + 12 + -7u + u2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -7u + u2 = 0 + 12
-7u + u2 = 0 + 12

Combine like terms: 0 + 12 = 12
-7u + u2 = 12

The u term is -7u.  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.
-7u + 12.25 + u2 = 12 + 12.25

Reorder the terms:
12.25 + -7u + u2 = 12 + 12.25

Combine like terms: 12 + 12.25 = 24.25
12.25 + -7u + u2 = 24.25

Factor a perfect square on the left side:
(u + -3.5)(u + -3.5) = 24.25

Calculate the square root of the right side: 4.924428901

Break this problem into two subproblems by setting 
(u + -3.5) equal to 4.924428901 and -4.924428901.

Subproblem 1

u + -3.5 = 4.924428901 Simplifying u + -3.5 = 4.924428901 Reorder the terms: -3.5 + u = 4.924428901 Solving -3.5 + u = 4.924428901 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + u = 4.924428901 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + u = 4.924428901 + 3.5 u = 4.924428901 + 3.5 Combine like terms: 4.924428901 + 3.5 = 8.424428901 u = 8.424428901 Simplifying u = 8.424428901

Subproblem 2

u + -3.5 = -4.924428901 Simplifying u + -3.5 = -4.924428901 Reorder the terms: -3.5 + u = -4.924428901 Solving -3.5 + u = -4.924428901 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + u = -4.924428901 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + u = -4.924428901 + 3.5 u = -4.924428901 + 3.5 Combine like terms: -4.924428901 + 3.5 = -1.424428901 u = -1.424428901 Simplifying u = -1.424428901

Solution

The solution to the problem is based on the solutions from the subproblems. u = {8.424428901, -1.424428901}

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