36-5x-5x^2=

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Solution for 36-5x-5x^2= equation:


Simplifying
36 + -5x + -5x2 = 0

Solving
36 + -5x + -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'.
-7.2 + x + x2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + x + 7.2 + x2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + x + x2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + x + x2 = 0 + 7.2
x + x2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
x + x2 = 7.2

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 7.2 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 7.2 + 0.25

Combine like terms: 7.2 + 0.25 = 7.45
1.25 + x2 = 7.45

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 7.45

Calculate the square root of the right side: 2.729468813

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.729468813 and -2.729468813.

Subproblem 1

x + 0.5 = 2.729468813 Simplifying x + 0.5 = 2.729468813 Reorder the terms: 0.5 + x = 2.729468813 Solving 0.5 + x = 2.729468813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.729468813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.729468813 + -0.5 x = 2.729468813 + -0.5 Combine like terms: 2.729468813 + -0.5 = 2.229468813 x = 2.229468813 Simplifying x = 2.229468813

Subproblem 2

x + 0.5 = -2.729468813 Simplifying x + 0.5 = -2.729468813 Reorder the terms: 0.5 + x = -2.729468813 Solving 0.5 + x = -2.729468813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.729468813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.729468813 + -0.5 x = -2.729468813 + -0.5 Combine like terms: -2.729468813 + -0.5 = -3.229468813 x = -3.229468813 Simplifying x = -3.229468813

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.229468813, -3.229468813}

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