(x+0.3)(x+1.7)=0

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Solution for (x+0.3)(x+1.7)=0 equation:


Simplifying
(x + 0.3)(x + 1.7) = 0

Reorder the terms:
(0.3 + x)(x + 1.7) = 0

Reorder the terms:
(0.3 + x)(1.7 + x) = 0

Multiply (0.3 + x) * (1.7 + x)
(0.3(1.7 + x) + x(1.7 + x)) = 0
((1.7 * 0.3 + x * 0.3) + x(1.7 + x)) = 0
((0.51 + 0.3x) + x(1.7 + x)) = 0
(0.51 + 0.3x + (1.7 * x + x * x)) = 0
(0.51 + 0.3x + (1.7x + x2)) = 0

Combine like terms: 0.3x + 1.7x = 2x
(0.51 + 2x + x2) = 0

Solving
0.51 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.51' to each side of the equation.
0.51 + 2x + -0.51 + x2 = 0 + -0.51

Reorder the terms:
0.51 + -0.51 + 2x + x2 = 0 + -0.51

Combine like terms: 0.51 + -0.51 = 0.00
0.00 + 2x + x2 = 0 + -0.51
2x + x2 = 0 + -0.51

Combine like terms: 0 + -0.51 = -0.51
2x + x2 = -0.51

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = -0.51 + 1

Reorder the terms:
1 + 2x + x2 = -0.51 + 1

Combine like terms: -0.51 + 1 = 0.49
1 + 2x + x2 = 0.49

Factor a perfect square on the left side:
(x + 1)(x + 1) = 0.49

Calculate the square root of the right side: 0.7

Break this problem into two subproblems by setting 
(x + 1) equal to 0.7 and -0.7.

Subproblem 1

x + 1 = 0.7 Simplifying x + 1 = 0.7 Reorder the terms: 1 + x = 0.7 Solving 1 + x = 0.7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0.7 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0.7 + -1 x = 0.7 + -1 Combine like terms: 0.7 + -1 = -0.3 x = -0.3 Simplifying x = -0.3

Subproblem 2

x + 1 = -0.7 Simplifying x + 1 = -0.7 Reorder the terms: 1 + x = -0.7 Solving 1 + x = -0.7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -0.7 + -1 Combine like terms: 1 + -1 = 0 0 + x = -0.7 + -1 x = -0.7 + -1 Combine like terms: -0.7 + -1 = -1.7 x = -1.7 Simplifying x = -1.7

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.3, -1.7}

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