4x^2+40x+25=0

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Solution for 4x^2+40x+25=0 equation:


Simplifying
4x2 + 40x + 25 = 0

Reorder the terms:
25 + 40x + 4x2 = 0

Solving
25 + 40x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
6.25 + 10x + x2 = 0

Move the constant term to the right:

Add '-6.25' to each side of the equation.
6.25 + 10x + -6.25 + x2 = 0 + -6.25

Reorder the terms:
6.25 + -6.25 + 10x + x2 = 0 + -6.25

Combine like terms: 6.25 + -6.25 = 0.00
0.00 + 10x + x2 = 0 + -6.25
10x + x2 = 0 + -6.25

Combine like terms: 0 + -6.25 = -6.25
10x + x2 = -6.25

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

Add '25' to each side of the equation.
10x + 25 + x2 = -6.25 + 25

Reorder the terms:
25 + 10x + x2 = -6.25 + 25

Combine like terms: -6.25 + 25 = 18.75
25 + 10x + x2 = 18.75

Factor a perfect square on the left side:
(x + 5)(x + 5) = 18.75

Calculate the square root of the right side: 4.330127019

Break this problem into two subproblems by setting 
(x + 5) equal to 4.330127019 and -4.330127019.

Subproblem 1

x + 5 = 4.330127019 Simplifying x + 5 = 4.330127019 Reorder the terms: 5 + x = 4.330127019 Solving 5 + x = 4.330127019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 4.330127019 + -5 Combine like terms: 5 + -5 = 0 0 + x = 4.330127019 + -5 x = 4.330127019 + -5 Combine like terms: 4.330127019 + -5 = -0.669872981 x = -0.669872981 Simplifying x = -0.669872981

Subproblem 2

x + 5 = -4.330127019 Simplifying x + 5 = -4.330127019 Reorder the terms: 5 + x = -4.330127019 Solving 5 + x = -4.330127019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -4.330127019 + -5 Combine like terms: 5 + -5 = 0 0 + x = -4.330127019 + -5 x = -4.330127019 + -5 Combine like terms: -4.330127019 + -5 = -9.330127019 x = -9.330127019 Simplifying x = -9.330127019

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.669872981, -9.330127019}

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