u^2+3u-25=0

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Solution for u^2+3u-25=0 equation:


Simplifying
u2 + 3u + -25 = 0

Reorder the terms:
-25 + 3u + u2 = 0

Solving
-25 + 3u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 3u + 25 + u2 = 0 + 25

Reorder the terms:
-25 + 25 + 3u + u2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 3u + u2 = 0 + 25
3u + u2 = 0 + 25

Combine like terms: 0 + 25 = 25
3u + u2 = 25

The u term is 3u.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3u + 2.25 + u2 = 25 + 2.25

Reorder the terms:
2.25 + 3u + u2 = 25 + 2.25

Combine like terms: 25 + 2.25 = 27.25
2.25 + 3u + u2 = 27.25

Factor a perfect square on the left side:
(u + 1.5)(u + 1.5) = 27.25

Calculate the square root of the right side: 5.220153254

Break this problem into two subproblems by setting 
(u + 1.5) equal to 5.220153254 and -5.220153254.

Subproblem 1

u + 1.5 = 5.220153254 Simplifying u + 1.5 = 5.220153254 Reorder the terms: 1.5 + u = 5.220153254 Solving 1.5 + u = 5.220153254 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + u = 5.220153254 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + u = 5.220153254 + -1.5 u = 5.220153254 + -1.5 Combine like terms: 5.220153254 + -1.5 = 3.720153254 u = 3.720153254 Simplifying u = 3.720153254

Subproblem 2

u + 1.5 = -5.220153254 Simplifying u + 1.5 = -5.220153254 Reorder the terms: 1.5 + u = -5.220153254 Solving 1.5 + u = -5.220153254 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + u = -5.220153254 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + u = -5.220153254 + -1.5 u = -5.220153254 + -1.5 Combine like terms: -5.220153254 + -1.5 = -6.720153254 u = -6.720153254 Simplifying u = -6.720153254

Solution

The solution to the problem is based on the solutions from the subproblems. u = {3.720153254, -6.720153254}

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