x^2+1.1x=.6975

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Solution for x^2+1.1x=.6975 equation:


Simplifying
x2 + 1.1x = 0.6975

Reorder the terms:
1.1x + x2 = 0.6975

Solving
1.1x + x2 = 0.6975

Solving for variable 'x'.

Reorder the terms:
-0.6975 + 1.1x + x2 = 0.6975 + -0.6975

Combine like terms: 0.6975 + -0.6975 = 0.0000
-0.6975 + 1.1x + x2 = 0.0000

Begin completing the square.

Move the constant term to the right:

Add '0.6975' to each side of the equation.
-0.6975 + 1.1x + 0.6975 + x2 = 0.0000 + 0.6975

Reorder the terms:
-0.6975 + 0.6975 + 1.1x + x2 = 0.0000 + 0.6975

Combine like terms: -0.6975 + 0.6975 = 0.0000
0.0000 + 1.1x + x2 = 0.0000 + 0.6975
1.1x + x2 = 0.0000 + 0.6975

Combine like terms: 0.0000 + 0.6975 = 0.6975
1.1x + x2 = 0.6975

The x term is 1.1x.  Take half its coefficient (0.55).
Square it (0.3025) and add it to both sides.

Add '0.3025' to each side of the equation.
1.1x + 0.3025 + x2 = 0.6975 + 0.3025

Reorder the terms:
0.3025 + 1.1x + x2 = 0.6975 + 0.3025

Combine like terms: 0.6975 + 0.3025 = 1
0.3025 + 1.1x + x2 = 1

Factor a perfect square on the left side:
(x + 0.55)(x + 0.55) = 1

Calculate the square root of the right side: 1

Break this problem into two subproblems by setting 
(x + 0.55) equal to 1 and -1.

Subproblem 1

x + 0.55 = 1 Simplifying x + 0.55 = 1 Reorder the terms: 0.55 + x = 1 Solving 0.55 + x = 1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.55' to each side of the equation. 0.55 + -0.55 + x = 1 + -0.55 Combine like terms: 0.55 + -0.55 = 0.00 0.00 + x = 1 + -0.55 x = 1 + -0.55 Combine like terms: 1 + -0.55 = 0.45 x = 0.45 Simplifying x = 0.45

Subproblem 2

x + 0.55 = -1 Simplifying x + 0.55 = -1 Reorder the terms: 0.55 + x = -1 Solving 0.55 + x = -1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.55' to each side of the equation. 0.55 + -0.55 + x = -1 + -0.55 Combine like terms: 0.55 + -0.55 = 0.00 0.00 + x = -1 + -0.55 x = -1 + -0.55 Combine like terms: -1 + -0.55 = -1.55 x = -1.55 Simplifying x = -1.55

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.45, -1.55}

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