(x+0.7)(x+1.2)=0

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Solution for (x+0.7)(x+1.2)=0 equation:


Simplifying
(x + 0.7)(x + 1.2) = 0

Reorder the terms:
(0.7 + x)(x + 1.2) = 0

Reorder the terms:
(0.7 + x)(1.2 + x) = 0

Multiply (0.7 + x) * (1.2 + x)
(0.7(1.2 + x) + x(1.2 + x)) = 0
((1.2 * 0.7 + x * 0.7) + x(1.2 + x)) = 0
((0.84 + 0.7x) + x(1.2 + x)) = 0
(0.84 + 0.7x + (1.2 * x + x * x)) = 0
(0.84 + 0.7x + (1.2x + x2)) = 0

Combine like terms: 0.7x + 1.2x = 1.9x
(0.84 + 1.9x + x2) = 0

Solving
0.84 + 1.9x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.84' to each side of the equation.
0.84 + 1.9x + -0.84 + x2 = 0 + -0.84

Reorder the terms:
0.84 + -0.84 + 1.9x + x2 = 0 + -0.84

Combine like terms: 0.84 + -0.84 = 0.00
0.00 + 1.9x + x2 = 0 + -0.84
1.9x + x2 = 0 + -0.84

Combine like terms: 0 + -0.84 = -0.84
1.9x + x2 = -0.84

The x term is 1.9x.  Take half its coefficient (0.95).
Square it (0.9025) and add it to both sides.

Add '0.9025' to each side of the equation.
1.9x + 0.9025 + x2 = -0.84 + 0.9025

Reorder the terms:
0.9025 + 1.9x + x2 = -0.84 + 0.9025

Combine like terms: -0.84 + 0.9025 = 0.0625
0.9025 + 1.9x + x2 = 0.0625

Factor a perfect square on the left side:
(x + 0.95)(x + 0.95) = 0.0625

Calculate the square root of the right side: 0.25

Break this problem into two subproblems by setting 
(x + 0.95) equal to 0.25 and -0.25.

Subproblem 1

x + 0.95 = 0.25 Simplifying x + 0.95 = 0.25 Reorder the terms: 0.95 + x = 0.25 Solving 0.95 + x = 0.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.95' to each side of the equation. 0.95 + -0.95 + x = 0.25 + -0.95 Combine like terms: 0.95 + -0.95 = 0.00 0.00 + x = 0.25 + -0.95 x = 0.25 + -0.95 Combine like terms: 0.25 + -0.95 = -0.7 x = -0.7 Simplifying x = -0.7

Subproblem 2

x + 0.95 = -0.25 Simplifying x + 0.95 = -0.25 Reorder the terms: 0.95 + x = -0.25 Solving 0.95 + x = -0.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.95' to each side of the equation. 0.95 + -0.95 + x = -0.25 + -0.95 Combine like terms: 0.95 + -0.95 = 0.00 0.00 + x = -0.25 + -0.95 x = -0.25 + -0.95 Combine like terms: -0.25 + -0.95 = -1.2 x = -1.2 Simplifying x = -1.2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.7, -1.2}

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