5x^2-9x-45=0

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Solution for 5x^2-9x-45=0 equation:


Simplifying
5x2 + -9x + -45 = 0

Reorder the terms:
-45 + -9x + 5x2 = 0

Solving
-45 + -9x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-9 + -1.8x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -1.8x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -1.8x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1.8x + x2 = 0 + 9
-1.8x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-1.8x + x2 = 9

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = 9 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = 9 + 0.81

Combine like terms: 9 + 0.81 = 9.81
0.81 + -1.8x + x2 = 9.81

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 9.81

Calculate the square root of the right side: 3.132091953

Break this problem into two subproblems by setting 
(x + -0.9) equal to 3.132091953 and -3.132091953.

Subproblem 1

x + -0.9 = 3.132091953 Simplifying x + -0.9 = 3.132091953 Reorder the terms: -0.9 + x = 3.132091953 Solving -0.9 + x = 3.132091953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 3.132091953 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 3.132091953 + 0.9 x = 3.132091953 + 0.9 Combine like terms: 3.132091953 + 0.9 = 4.032091953 x = 4.032091953 Simplifying x = 4.032091953

Subproblem 2

x + -0.9 = -3.132091953 Simplifying x + -0.9 = -3.132091953 Reorder the terms: -0.9 + x = -3.132091953 Solving -0.9 + x = -3.132091953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -3.132091953 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -3.132091953 + 0.9 x = -3.132091953 + 0.9 Combine like terms: -3.132091953 + 0.9 = -2.232091953 x = -2.232091953 Simplifying x = -2.232091953

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.032091953, -2.232091953}

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