x^2+7x+20.25=19.25

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Solution for x^2+7x+20.25=19.25 equation:


Simplifying
x2 + 7x + 20.25 = 19.25

Reorder the terms:
20.25 + 7x + x2 = 19.25

Solving
20.25 + 7x + x2 = 19.25

Solving for variable 'x'.

Reorder the terms:
20.25 + -19.25 + 7x + x2 = 19.25 + -19.25

Combine like terms: 20.25 + -19.25 = 1
1 + 7x + x2 = 19.25 + -19.25

Combine like terms: 19.25 + -19.25 = 0.00
1 + 7x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 7x + -1 + x2 = 0.00 + -1

Reorder the terms:
1 + -1 + 7x + x2 = 0.00 + -1

Combine like terms: 1 + -1 = 0
0 + 7x + x2 = 0.00 + -1
7x + x2 = 0.00 + -1

Combine like terms: 0.00 + -1 = -1
7x + x2 = -1

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = -1 + 12.25

Reorder the terms:
12.25 + 7x + x2 = -1 + 12.25

Combine like terms: -1 + 12.25 = 11.25
12.25 + 7x + x2 = 11.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 11.25

Calculate the square root of the right side: 3.354101966

Break this problem into two subproblems by setting 
(x + 3.5) equal to 3.354101966 and -3.354101966.

Subproblem 1

x + 3.5 = 3.354101966 Simplifying x + 3.5 = 3.354101966 Reorder the terms: 3.5 + x = 3.354101966 Solving 3.5 + x = 3.354101966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 3.354101966 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 3.354101966 + -3.5 x = 3.354101966 + -3.5 Combine like terms: 3.354101966 + -3.5 = -0.145898034 x = -0.145898034 Simplifying x = -0.145898034

Subproblem 2

x + 3.5 = -3.354101966 Simplifying x + 3.5 = -3.354101966 Reorder the terms: 3.5 + x = -3.354101966 Solving 3.5 + x = -3.354101966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -3.354101966 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -3.354101966 + -3.5 x = -3.354101966 + -3.5 Combine like terms: -3.354101966 + -3.5 = -6.854101966 x = -6.854101966 Simplifying x = -6.854101966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.145898034, -6.854101966}

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