45x^2-4x-5=0

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Solution for 45x^2-4x-5=0 equation:


Simplifying
45x2 + -4x + -5 = 0

Reorder the terms:
-5 + -4x + 45x2 = 0

Solving
-5 + -4x + 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 + -0.08888888889x + x2 = 0

Move the constant term to the right:

Add '0.1111111111' to each side of the equation.
-0.1111111111 + -0.08888888889x + 0.1111111111 + x2 = 0 + 0.1111111111

Reorder the terms:
-0.1111111111 + 0.1111111111 + -0.08888888889x + x2 = 0 + 0.1111111111

Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000
0.0000000000 + -0.08888888889x + x2 = 0 + 0.1111111111
-0.08888888889x + x2 = 0 + 0.1111111111

Combine like terms: 0 + 0.1111111111 = 0.1111111111
-0.08888888889x + x2 = 0.1111111111

The x term is -0.08888888889x.  Take half its coefficient (-0.04444444445).
Square it (0.001975308642) and add it to both sides.

Add '0.001975308642' to each side of the equation.
-0.08888888889x + 0.001975308642 + x2 = 0.1111111111 + 0.001975308642

Reorder the terms:
0.001975308642 + -0.08888888889x + x2 = 0.1111111111 + 0.001975308642

Combine like terms: 0.1111111111 + 0.001975308642 = 0.113086419742
0.001975308642 + -0.08888888889x + x2 = 0.113086419742

Factor a perfect square on the left side:
(x + -0.04444444445)(x + -0.04444444445) = 0.113086419742

Calculate the square root of the right side: 0.336283243

Break this problem into two subproblems by setting 
(x + -0.04444444445) equal to 0.336283243 and -0.336283243.

Subproblem 1

x + -0.04444444445 = 0.336283243 Simplifying x + -0.04444444445 = 0.336283243 Reorder the terms: -0.04444444445 + x = 0.336283243 Solving -0.04444444445 + x = 0.336283243 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.04444444445' to each side of the equation. -0.04444444445 + 0.04444444445 + x = 0.336283243 + 0.04444444445 Combine like terms: -0.04444444445 + 0.04444444445 = 0.00000000000 0.00000000000 + x = 0.336283243 + 0.04444444445 x = 0.336283243 + 0.04444444445 Combine like terms: 0.336283243 + 0.04444444445 = 0.38072768745 x = 0.38072768745 Simplifying x = 0.38072768745

Subproblem 2

x + -0.04444444445 = -0.336283243 Simplifying x + -0.04444444445 = -0.336283243 Reorder the terms: -0.04444444445 + x = -0.336283243 Solving -0.04444444445 + x = -0.336283243 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.04444444445' to each side of the equation. -0.04444444445 + 0.04444444445 + x = -0.336283243 + 0.04444444445 Combine like terms: -0.04444444445 + 0.04444444445 = 0.00000000000 0.00000000000 + x = -0.336283243 + 0.04444444445 x = -0.336283243 + 0.04444444445 Combine like terms: -0.336283243 + 0.04444444445 = -0.29183879855 x = -0.29183879855 Simplifying x = -0.29183879855

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.38072768745, -0.29183879855}

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