45x^2+18x-5=0

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Solution for 45x^2+18x-5=0 equation:


Simplifying
45x2 + 18x + -5 = 0

Reorder the terms:
-5 + 18x + 45x2 = 0

Solving
-5 + 18x + 45x2 = 0

Solving for variable 'x'.

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

Divide each side by '45'.
-0.1111111111 + 0.4x + x2 = 0

Move the constant term to the right:

Add '0.1111111111' to each side of the equation.
-0.1111111111 + 0.4x + 0.1111111111 + x2 = 0 + 0.1111111111

Reorder the terms:
-0.1111111111 + 0.1111111111 + 0.4x + x2 = 0 + 0.1111111111

Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000
0.0000000000 + 0.4x + x2 = 0 + 0.1111111111
0.4x + x2 = 0 + 0.1111111111

Combine like terms: 0 + 0.1111111111 = 0.1111111111
0.4x + x2 = 0.1111111111

The x term is 0.4x.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4x + 0.04 + x2 = 0.1111111111 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = 0.1111111111 + 0.04

Combine like terms: 0.1111111111 + 0.04 = 0.1511111111
0.04 + 0.4x + x2 = 0.1511111111

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = 0.1511111111

Calculate the square root of the right side: 0.388730126

Break this problem into two subproblems by setting 
(x + 0.2) equal to 0.388730126 and -0.388730126.

Subproblem 1

x + 0.2 = 0.388730126 Simplifying x + 0.2 = 0.388730126 Reorder the terms: 0.2 + x = 0.388730126 Solving 0.2 + x = 0.388730126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = 0.388730126 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = 0.388730126 + -0.2 x = 0.388730126 + -0.2 Combine like terms: 0.388730126 + -0.2 = 0.188730126 x = 0.188730126 Simplifying x = 0.188730126

Subproblem 2

x + 0.2 = -0.388730126 Simplifying x + 0.2 = -0.388730126 Reorder the terms: 0.2 + x = -0.388730126 Solving 0.2 + x = -0.388730126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = -0.388730126 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = -0.388730126 + -0.2 x = -0.388730126 + -0.2 Combine like terms: -0.388730126 + -0.2 = -0.588730126 x = -0.588730126 Simplifying x = -0.588730126

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.188730126, -0.588730126}

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