x^2+10x+25=0.64

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Solution for x^2+10x+25=0.64 equation:


Simplifying
x2 + 10x + 25 = 0.64

Reorder the terms:
25 + 10x + x2 = 0.64

Solving
25 + 10x + x2 = 0.64

Solving for variable 'x'.

Reorder the terms:
25 + -0.64 + 10x + x2 = 0.64 + -0.64

Combine like terms: 25 + -0.64 = 24.36
24.36 + 10x + x2 = 0.64 + -0.64

Combine like terms: 0.64 + -0.64 = 0.00
24.36 + 10x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '-24.36' to each side of the equation.
24.36 + 10x + -24.36 + x2 = 0.00 + -24.36

Reorder the terms:
24.36 + -24.36 + 10x + x2 = 0.00 + -24.36

Combine like terms: 24.36 + -24.36 = 0.00
0.00 + 10x + x2 = 0.00 + -24.36
10x + x2 = 0.00 + -24.36

Combine like terms: 0.00 + -24.36 = -24.36
10x + x2 = -24.36

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 = -24.36 + 25

Reorder the terms:
25 + 10x + x2 = -24.36 + 25

Combine like terms: -24.36 + 25 = 0.64
25 + 10x + x2 = 0.64

Factor a perfect square on the left side:
(x + 5)(x + 5) = 0.64

Calculate the square root of the right side: 0.8

Break this problem into two subproblems by setting 
(x + 5) equal to 0.8 and -0.8.

Subproblem 1

x + 5 = 0.8 Simplifying x + 5 = 0.8 Reorder the terms: 5 + x = 0.8 Solving 5 + x = 0.8 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 = 0.8 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0.8 + -5 x = 0.8 + -5 Combine like terms: 0.8 + -5 = -4.2 x = -4.2 Simplifying x = -4.2

Subproblem 2

x + 5 = -0.8 Simplifying x + 5 = -0.8 Reorder the terms: 5 + x = -0.8 Solving 5 + x = -0.8 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 = -0.8 + -5 Combine like terms: 5 + -5 = 0 0 + x = -0.8 + -5 x = -0.8 + -5 Combine like terms: -0.8 + -5 = -5.8 x = -5.8 Simplifying x = -5.8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.2, -5.8}

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