x^2+2x+3=4.25

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Solution for x^2+2x+3=4.25 equation:


Simplifying
x2 + 2x + 3 = 4.25

Reorder the terms:
3 + 2x + x2 = 4.25

Solving
3 + 2x + x2 = 4.25

Solving for variable 'x'.

Reorder the terms:
3 + -4.25 + 2x + x2 = 4.25 + -4.25

Combine like terms: 3 + -4.25 = -1.25
-1.25 + 2x + x2 = 4.25 + -4.25

Combine like terms: 4.25 + -4.25 = 0.00
-1.25 + 2x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 2x + 1.25 + x2 = 0.00 + 1.25

Reorder the terms:
-1.25 + 1.25 + 2x + x2 = 0.00 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 2x + x2 = 0.00 + 1.25
2x + x2 = 0.00 + 1.25

Combine like terms: 0.00 + 1.25 = 1.25
2x + x2 = 1.25

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 = 1.25 + 1

Reorder the terms:
1 + 2x + x2 = 1.25 + 1

Combine like terms: 1.25 + 1 = 2.25
1 + 2x + x2 = 2.25

Factor a perfect square on the left side:
(x + 1)(x + 1) = 2.25

Calculate the square root of the right side: 1.5

Break this problem into two subproblems by setting 
(x + 1) equal to 1.5 and -1.5.

Subproblem 1

x + 1 = 1.5 Simplifying x + 1 = 1.5 Reorder the terms: 1 + x = 1.5 Solving 1 + x = 1.5 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 = 1.5 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.5 + -1 x = 1.5 + -1 Combine like terms: 1.5 + -1 = 0.5 x = 0.5 Simplifying x = 0.5

Subproblem 2

x + 1 = -1.5 Simplifying x + 1 = -1.5 Reorder the terms: 1 + x = -1.5 Solving 1 + x = -1.5 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 = -1.5 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.5 + -1 x = -1.5 + -1 Combine like terms: -1.5 + -1 = -2.5 x = -2.5 Simplifying x = -2.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5, -2.5}

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