9x^2+20x-45=0

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Solution for 9x^2+20x-45=0 equation:


Simplifying
9x2 + 20x + -45 = 0

Reorder the terms:
-45 + 20x + 9x2 = 0

Solving
-45 + 20x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-5 + 2.222222222x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 2.222222222x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 2.222222222x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 2.222222222x + x2 = 0 + 5
2.222222222x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
2.222222222x + x2 = 5

The x term is 2.222222222x.  Take half its coefficient (1.111111111).
Square it (1.234567901) and add it to both sides.

Add '1.234567901' to each side of the equation.
2.222222222x + 1.234567901 + x2 = 5 + 1.234567901

Reorder the terms:
1.234567901 + 2.222222222x + x2 = 5 + 1.234567901

Combine like terms: 5 + 1.234567901 = 6.234567901
1.234567901 + 2.222222222x + x2 = 6.234567901

Factor a perfect square on the left side:
(x + 1.111111111)(x + 1.111111111) = 6.234567901

Calculate the square root of the right side: 2.496911673

Break this problem into two subproblems by setting 
(x + 1.111111111) equal to 2.496911673 and -2.496911673.

Subproblem 1

x + 1.111111111 = 2.496911673 Simplifying x + 1.111111111 = 2.496911673 Reorder the terms: 1.111111111 + x = 2.496911673 Solving 1.111111111 + x = 2.496911673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.111111111' to each side of the equation. 1.111111111 + -1.111111111 + x = 2.496911673 + -1.111111111 Combine like terms: 1.111111111 + -1.111111111 = 0.000000000 0.000000000 + x = 2.496911673 + -1.111111111 x = 2.496911673 + -1.111111111 Combine like terms: 2.496911673 + -1.111111111 = 1.385800562 x = 1.385800562 Simplifying x = 1.385800562

Subproblem 2

x + 1.111111111 = -2.496911673 Simplifying x + 1.111111111 = -2.496911673 Reorder the terms: 1.111111111 + x = -2.496911673 Solving 1.111111111 + x = -2.496911673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.111111111' to each side of the equation. 1.111111111 + -1.111111111 + x = -2.496911673 + -1.111111111 Combine like terms: 1.111111111 + -1.111111111 = 0.000000000 0.000000000 + x = -2.496911673 + -1.111111111 x = -2.496911673 + -1.111111111 Combine like terms: -2.496911673 + -1.111111111 = -3.608022784 x = -3.608022784 Simplifying x = -3.608022784

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.385800562, -3.608022784}

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