5x^2+12x-30=0

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Solution for 5x^2+12x-30=0 equation:


Simplifying
5x2 + 12x + -30 = 0

Reorder the terms:
-30 + 12x + 5x2 = 0

Solving
-30 + 12x + 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'.
-6 + 2.4x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 2.4x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 2.4x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 2.4x + x2 = 0 + 6
2.4x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
2.4x + x2 = 6

The x term is 2.4x.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4x + 1.44 + x2 = 6 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = 6 + 1.44

Combine like terms: 6 + 1.44 = 7.44
1.44 + 2.4x + x2 = 7.44

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 7.44

Calculate the square root of the right side: 2.727636339

Break this problem into two subproblems by setting 
(x + 1.2) equal to 2.727636339 and -2.727636339.

Subproblem 1

x + 1.2 = 2.727636339 Simplifying x + 1.2 = 2.727636339 Reorder the terms: 1.2 + x = 2.727636339 Solving 1.2 + x = 2.727636339 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = 2.727636339 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 2.727636339 + -1.2 x = 2.727636339 + -1.2 Combine like terms: 2.727636339 + -1.2 = 1.527636339 x = 1.527636339 Simplifying x = 1.527636339

Subproblem 2

x + 1.2 = -2.727636339 Simplifying x + 1.2 = -2.727636339 Reorder the terms: 1.2 + x = -2.727636339 Solving 1.2 + x = -2.727636339 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = -2.727636339 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -2.727636339 + -1.2 x = -2.727636339 + -1.2 Combine like terms: -2.727636339 + -1.2 = -3.927636339 x = -3.927636339 Simplifying x = -3.927636339

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.527636339, -3.927636339}

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