-4u^2-5u+10=3

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Solution for -4u^2-5u+10=3 equation:


Simplifying
-4u2 + -5u + 10 = 3

Reorder the terms:
10 + -5u + -4u2 = 3

Solving
10 + -5u + -4u2 = 3

Solving for variable 'u'.

Reorder the terms:
10 + -3 + -5u + -4u2 = 3 + -3

Combine like terms: 10 + -3 = 7
7 + -5u + -4u2 = 3 + -3

Combine like terms: 3 + -3 = 0
7 + -5u + -4u2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-1.75 + 1.25u + u2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + 1.25u + 1.75 + u2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + 1.25u + u2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + 1.25u + u2 = 0 + 1.75
1.25u + u2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
1.25u + u2 = 1.75

The u term is 1.25u.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25u + 0.390625 + u2 = 1.75 + 0.390625

Reorder the terms:
0.390625 + 1.25u + u2 = 1.75 + 0.390625

Combine like terms: 1.75 + 0.390625 = 2.140625
0.390625 + 1.25u + u2 = 2.140625

Factor a perfect square on the left side:
(u + 0.625)(u + 0.625) = 2.140625

Calculate the square root of the right side: 1.463087489

Break this problem into two subproblems by setting 
(u + 0.625) equal to 1.463087489 and -1.463087489.

Subproblem 1

u + 0.625 = 1.463087489 Simplifying u + 0.625 = 1.463087489 Reorder the terms: 0.625 + u = 1.463087489 Solving 0.625 + u = 1.463087489 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + u = 1.463087489 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + u = 1.463087489 + -0.625 u = 1.463087489 + -0.625 Combine like terms: 1.463087489 + -0.625 = 0.838087489 u = 0.838087489 Simplifying u = 0.838087489

Subproblem 2

u + 0.625 = -1.463087489 Simplifying u + 0.625 = -1.463087489 Reorder the terms: 0.625 + u = -1.463087489 Solving 0.625 + u = -1.463087489 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + u = -1.463087489 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + u = -1.463087489 + -0.625 u = -1.463087489 + -0.625 Combine like terms: -1.463087489 + -0.625 = -2.088087489 u = -2.088087489 Simplifying u = -2.088087489

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.838087489, -2.088087489}

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