2u^2+20u-70=0

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Solution for 2u^2+20u-70=0 equation: 


Simplifying
2u2 + 20u + -70 = 0

Reorder the terms:
-70 + 20u + 2u2 = 0

Solving
-70 + 20u + 2u2 = 0

Solving for variable 'u'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-35 + 10u + u2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-35 + 10u + u2)' equal to zero and attempt to solve:

Simplifying
-35 + 10u + u2 = 0

Solving
-35 + 10u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + 10u + 35 + u2 = 0 + 35

Reorder the terms:
-35 + 35 + 10u + u2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + 10u + u2 = 0 + 35
10u + u2 = 0 + 35

Combine like terms: 0 + 35 = 35
10u + u2 = 35

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

Add '25' to each side of the equation.
10u + 25 + u2 = 35 + 25

Reorder the terms:
25 + 10u + u2 = 35 + 25

Combine like terms: 35 + 25 = 60
25 + 10u + u2 = 60

Factor a perfect square on the left side:
(u + 5)(u + 5) = 60

Calculate the square root of the right side: 7.745966692

Break this problem into two subproblems by setting 
(u + 5) equal to 7.745966692 and -7.745966692.


Subproblem 1
u + 5 = 7.745966692

Simplifying
u + 5 = 7.745966692

Reorder the terms:
5 + u = 7.745966692

Solving
5 + u = 7.745966692

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '-5' to each side of the equation.
5 + -5 + u = 7.745966692 + -5

Combine like terms: 5 + -5 = 0
0 + u = 7.745966692 + -5
u = 7.745966692 + -5

Combine like terms: 7.745966692 + -5 = 2.745966692
u = 2.745966692

Simplifying
u = 2.745966692


Subproblem 2
u + 5 = -7.745966692

Simplifying
u + 5 = -7.745966692

Reorder the terms:
5 + u = -7.745966692

Solving
5 + u = -7.745966692

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '-5' to each side of the equation.
5 + -5 + u = -7.745966692 + -5

Combine like terms: 5 + -5 = 0
0 + u = -7.745966692 + -5
u = -7.745966692 + -5

Combine like terms: -7.745966692 + -5 = -12.745966692
u = -12.745966692

Simplifying
u = -12.745966692


Solution
The solution to the problem is based on the solutions
from the subproblems.
u = {2.745966692, -12.745966692}
Solution
u = {2.745966692, -12.745966692}

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