4x^2+28x+25=0

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Solution for 4x^2+28x+25=0 equation:


Simplifying
4x2 + 28x + 25 = 0

Reorder the terms:
25 + 28x + 4x2 = 0

Solving
25 + 28x + 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 + 7x + x2 = 0

Move the constant term to the right:

Add '-6.25' to each side of the equation.
6.25 + 7x + -6.25 + x2 = 0 + -6.25

Reorder the terms:
6.25 + -6.25 + 7x + x2 = 0 + -6.25

Combine like terms: 6.25 + -6.25 = 0.00
0.00 + 7x + x2 = 0 + -6.25
7x + x2 = 0 + -6.25

Combine like terms: 0 + -6.25 = -6.25
7x + x2 = -6.25

The x term is 7x.  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.
7x + 12.25 + x2 = -6.25 + 12.25

Reorder the terms:
12.25 + 7x + x2 = -6.25 + 12.25

Combine like terms: -6.25 + 12.25 = 6
12.25 + 7x + x2 = 6

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(x + 3.5) equal to 2.449489743 and -2.449489743.

Subproblem 1

x + 3.5 = 2.449489743 Simplifying x + 3.5 = 2.449489743 Reorder the terms: 3.5 + x = 2.449489743 Solving 3.5 + x = 2.449489743 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 2.449489743 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 2.449489743 + -3.5 x = 2.449489743 + -3.5 Combine like terms: 2.449489743 + -3.5 = -1.050510257 x = -1.050510257 Simplifying x = -1.050510257

Subproblem 2

x + 3.5 = -2.449489743 Simplifying x + 3.5 = -2.449489743 Reorder the terms: 3.5 + x = -2.449489743 Solving 3.5 + x = -2.449489743 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -2.449489743 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -2.449489743 + -3.5 x = -2.449489743 + -3.5 Combine like terms: -2.449489743 + -3.5 = -5.949489743 x = -5.949489743 Simplifying x = -5.949489743

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.050510257, -5.949489743}

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