5x^2-22x-90=0

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Solution for 5x^2-22x-90=0 equation:


Simplifying
5x2 + -22x + -90 = 0

Reorder the terms:
-90 + -22x + 5x2 = 0

Solving
-90 + -22x + 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'.
-18 + -4.4x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -4.4x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + -4.4x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -4.4x + x2 = 0 + 18
-4.4x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-4.4x + x2 = 18

The x term is -4.4x.  Take half its coefficient (-2.2).
Square it (4.84) and add it to both sides.

Add '4.84' to each side of the equation.
-4.4x + 4.84 + x2 = 18 + 4.84

Reorder the terms:
4.84 + -4.4x + x2 = 18 + 4.84

Combine like terms: 18 + 4.84 = 22.84
4.84 + -4.4x + x2 = 22.84

Factor a perfect square on the left side:
(x + -2.2)(x + -2.2) = 22.84

Calculate the square root of the right side: 4.779121258

Break this problem into two subproblems by setting 
(x + -2.2) equal to 4.779121258 and -4.779121258.

Subproblem 1

x + -2.2 = 4.779121258 Simplifying x + -2.2 = 4.779121258 Reorder the terms: -2.2 + x = 4.779121258 Solving -2.2 + x = 4.779121258 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.2' to each side of the equation. -2.2 + 2.2 + x = 4.779121258 + 2.2 Combine like terms: -2.2 + 2.2 = 0.0 0.0 + x = 4.779121258 + 2.2 x = 4.779121258 + 2.2 Combine like terms: 4.779121258 + 2.2 = 6.979121258 x = 6.979121258 Simplifying x = 6.979121258

Subproblem 2

x + -2.2 = -4.779121258 Simplifying x + -2.2 = -4.779121258 Reorder the terms: -2.2 + x = -4.779121258 Solving -2.2 + x = -4.779121258 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.2' to each side of the equation. -2.2 + 2.2 + x = -4.779121258 + 2.2 Combine like terms: -2.2 + 2.2 = 0.0 0.0 + x = -4.779121258 + 2.2 x = -4.779121258 + 2.2 Combine like terms: -4.779121258 + 2.2 = -2.579121258 x = -2.579121258 Simplifying x = -2.579121258

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.979121258, -2.579121258}

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