(.03+x)(.8+x)=

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Solution for (.03+x)(.8+x)= equation:


Simplifying
(0.03 + x)(0.8 + x) = 0

Multiply (0.03 + x) * (0.8 + x)
(0.03(0.8 + x) + x(0.8 + x)) = 0
((0.8 * 0.03 + x * 0.03) + x(0.8 + x)) = 0
((0.024 + 0.03x) + x(0.8 + x)) = 0
(0.024 + 0.03x + (0.8 * x + x * x)) = 0
(0.024 + 0.03x + (0.8x + x2)) = 0

Combine like terms: 0.03x + 0.8x = 0.83x
(0.024 + 0.83x + x2) = 0

Solving
0.024 + 0.83x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.024' to each side of the equation.
0.024 + 0.83x + -0.024 + x2 = 0 + -0.024

Reorder the terms:
0.024 + -0.024 + 0.83x + x2 = 0 + -0.024

Combine like terms: 0.024 + -0.024 = 0.000
0.000 + 0.83x + x2 = 0 + -0.024
0.83x + x2 = 0 + -0.024

Combine like terms: 0 + -0.024 = -0.024
0.83x + x2 = -0.024

The x term is 0.83x.  Take half its coefficient (0.415).
Square it (0.172225) and add it to both sides.

Add '0.172225' to each side of the equation.
0.83x + 0.172225 + x2 = -0.024 + 0.172225

Reorder the terms:
0.172225 + 0.83x + x2 = -0.024 + 0.172225

Combine like terms: -0.024 + 0.172225 = 0.148225
0.172225 + 0.83x + x2 = 0.148225

Factor a perfect square on the left side:
(x + 0.415)(x + 0.415) = 0.148225

Calculate the square root of the right side: 0.385

Break this problem into two subproblems by setting 
(x + 0.415) equal to 0.385 and -0.385.

Subproblem 1

x + 0.415 = 0.385 Simplifying x + 0.415 = 0.385 Reorder the terms: 0.415 + x = 0.385 Solving 0.415 + x = 0.385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.415' to each side of the equation. 0.415 + -0.415 + x = 0.385 + -0.415 Combine like terms: 0.415 + -0.415 = 0.000 0.000 + x = 0.385 + -0.415 x = 0.385 + -0.415 Combine like terms: 0.385 + -0.415 = -0.03 x = -0.03 Simplifying x = -0.03

Subproblem 2

x + 0.415 = -0.385 Simplifying x + 0.415 = -0.385 Reorder the terms: 0.415 + x = -0.385 Solving 0.415 + x = -0.385 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.415' to each side of the equation. 0.415 + -0.415 + x = -0.385 + -0.415 Combine like terms: 0.415 + -0.415 = 0.000 0.000 + x = -0.385 + -0.415 x = -0.385 + -0.415 Combine like terms: -0.385 + -0.415 = -0.8 x = -0.8 Simplifying x = -0.8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.03, -0.8}

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