10x^2+20x-45=8

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Solution for 10x^2+20x-45=8 equation:


Simplifying
10x2 + 20x + -45 = 8

Reorder the terms:
-45 + 20x + 10x2 = 8

Solving
-45 + 20x + 10x2 = 8

Solving for variable 'x'.

Reorder the terms:
-45 + -8 + 20x + 10x2 = 8 + -8

Combine like terms: -45 + -8 = -53
-53 + 20x + 10x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-53 + 20x + 10x2 = 0

Begin completing the square.  Divide all terms by
10 the coefficient of the squared term: 

Divide each side by '10'.
-5.3 + 2x + x2 = 0

Move the constant term to the right:

Add '5.3' to each side of the equation.
-5.3 + 2x + 5.3 + x2 = 0 + 5.3

Reorder the terms:
-5.3 + 5.3 + 2x + x2 = 0 + 5.3

Combine like terms: -5.3 + 5.3 = 0.0
0.0 + 2x + x2 = 0 + 5.3
2x + x2 = 0 + 5.3

Combine like terms: 0 + 5.3 = 5.3
2x + x2 = 5.3

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 = 5.3 + 1

Reorder the terms:
1 + 2x + x2 = 5.3 + 1

Combine like terms: 5.3 + 1 = 6.3
1 + 2x + x2 = 6.3

Factor a perfect square on the left side:
(x + 1)(x + 1) = 6.3

Calculate the square root of the right side: 2.50998008

Break this problem into two subproblems by setting 
(x + 1) equal to 2.50998008 and -2.50998008.

Subproblem 1

x + 1 = 2.50998008 Simplifying x + 1 = 2.50998008 Reorder the terms: 1 + x = 2.50998008 Solving 1 + x = 2.50998008 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 = 2.50998008 + -1 Combine like terms: 1 + -1 = 0 0 + x = 2.50998008 + -1 x = 2.50998008 + -1 Combine like terms: 2.50998008 + -1 = 1.50998008 x = 1.50998008 Simplifying x = 1.50998008

Subproblem 2

x + 1 = -2.50998008 Simplifying x + 1 = -2.50998008 Reorder the terms: 1 + x = -2.50998008 Solving 1 + x = -2.50998008 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 = -2.50998008 + -1 Combine like terms: 1 + -1 = 0 0 + x = -2.50998008 + -1 x = -2.50998008 + -1 Combine like terms: -2.50998008 + -1 = -3.50998008 x = -3.50998008 Simplifying x = -3.50998008

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.50998008, -3.50998008}

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