0=-5x^2-30x+2

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Solution for 0=-5x^2-30x+2 equation:


Simplifying
0 = -5x2 + -30x + 2

Reorder the terms:
0 = 2 + -30x + -5x2

Solving
0 = 2 + -30x + -5x2

Solving for variable 'x'.

Combine like terms: 0 + -2 = -2
-2 + 30x + 5x2 = 2 + -30x + -5x2 + -2 + 30x + 5x2

Reorder the terms:
-2 + 30x + 5x2 = 2 + -2 + -30x + 30x + -5x2 + 5x2

Combine like terms: 2 + -2 = 0
-2 + 30x + 5x2 = 0 + -30x + 30x + -5x2 + 5x2
-2 + 30x + 5x2 = -30x + 30x + -5x2 + 5x2

Combine like terms: -30x + 30x = 0
-2 + 30x + 5x2 = 0 + -5x2 + 5x2
-2 + 30x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
-2 + 30x + 5x2 = 0

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

Divide each side by '5'.
-0.4 + 6x + x2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 6x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 6x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 6x + x2 = 0 + 0.4
6x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
6x + x2 = 0.4

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 0.4 + 9

Reorder the terms:
9 + 6x + x2 = 0.4 + 9

Combine like terms: 0.4 + 9 = 9.4
9 + 6x + x2 = 9.4

Factor a perfect square on the left side:
(x + 3)(x + 3) = 9.4

Calculate the square root of the right side: 3.065941943

Break this problem into two subproblems by setting 
(x + 3) equal to 3.065941943 and -3.065941943.

Subproblem 1

x + 3 = 3.065941943 Simplifying x + 3 = 3.065941943 Reorder the terms: 3 + x = 3.065941943 Solving 3 + x = 3.065941943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 3.065941943 + -3 Combine like terms: 3 + -3 = 0 0 + x = 3.065941943 + -3 x = 3.065941943 + -3 Combine like terms: 3.065941943 + -3 = 0.065941943 x = 0.065941943 Simplifying x = 0.065941943

Subproblem 2

x + 3 = -3.065941943 Simplifying x + 3 = -3.065941943 Reorder the terms: 3 + x = -3.065941943 Solving 3 + x = -3.065941943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -3.065941943 + -3 Combine like terms: 3 + -3 = 0 0 + x = -3.065941943 + -3 x = -3.065941943 + -3 Combine like terms: -3.065941943 + -3 = -6.065941943 x = -6.065941943 Simplifying x = -6.065941943

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.065941943, -6.065941943}

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