x^2+2.75x+1.9=6.9

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Solution for x^2+2.75x+1.9=6.9 equation:


Simplifying
x2 + 2.75x + 1.9 = 6.9

Reorder the terms:
1.9 + 2.75x + x2 = 6.9

Solving
1.9 + 2.75x + x2 = 6.9

Solving for variable 'x'.

Reorder the terms:
1.9 + -6.9 + 2.75x + x2 = 6.9 + -6.9

Combine like terms: 1.9 + -6.9 = -5
-5 + 2.75x + x2 = 6.9 + -6.9

Combine like terms: 6.9 + -6.9 = 0.0
-5 + 2.75x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 2.75x + 5 + x2 = 0.0 + 5

Reorder the terms:
-5 + 5 + 2.75x + x2 = 0.0 + 5

Combine like terms: -5 + 5 = 0
0 + 2.75x + x2 = 0.0 + 5
2.75x + x2 = 0.0 + 5

Combine like terms: 0.0 + 5 = 5
2.75x + x2 = 5

The x term is 2.75x.  Take half its coefficient (1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
2.75x + 1.890625 + x2 = 5 + 1.890625

Reorder the terms:
1.890625 + 2.75x + x2 = 5 + 1.890625

Combine like terms: 5 + 1.890625 = 6.890625
1.890625 + 2.75x + x2 = 6.890625

Factor a perfect square on the left side:
(x + 1.375)(x + 1.375) = 6.890625

Calculate the square root of the right side: 2.625

Break this problem into two subproblems by setting 
(x + 1.375) equal to 2.625 and -2.625.

Subproblem 1

x + 1.375 = 2.625 Simplifying x + 1.375 = 2.625 Reorder the terms: 1.375 + x = 2.625 Solving 1.375 + x = 2.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = 2.625 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = 2.625 + -1.375 x = 2.625 + -1.375 Combine like terms: 2.625 + -1.375 = 1.25 x = 1.25 Simplifying x = 1.25

Subproblem 2

x + 1.375 = -2.625 Simplifying x + 1.375 = -2.625 Reorder the terms: 1.375 + x = -2.625 Solving 1.375 + x = -2.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = -2.625 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = -2.625 + -1.375 x = -2.625 + -1.375 Combine like terms: -2.625 + -1.375 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.25, -4}

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