0=0.02x^2+1.2x-14

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Solution for 0=0.02x^2+1.2x-14 equation:


Simplifying
0 = 0.02x2 + 1.2x + -14

Reorder the terms:
0 = -14 + 1.2x + 0.02x2

Solving
0 = -14 + 1.2x + 0.02x2

Solving for variable 'x'.

Combine like terms: 0 + 14 = 14
14 + -1.2x + -0.02x2 = -14 + 1.2x + 0.02x2 + 14 + -1.2x + -0.02x2

Reorder the terms:
14 + -1.2x + -0.02x2 = -14 + 14 + 1.2x + -1.2x + 0.02x2 + -0.02x2

Combine like terms: -14 + 14 = 0
14 + -1.2x + -0.02x2 = 0 + 1.2x + -1.2x + 0.02x2 + -0.02x2
14 + -1.2x + -0.02x2 = 1.2x + -1.2x + 0.02x2 + -0.02x2

Combine like terms: 1.2x + -1.2x = 0.0
14 + -1.2x + -0.02x2 = 0.0 + 0.02x2 + -0.02x2
14 + -1.2x + -0.02x2 = 0.02x2 + -0.02x2

Combine like terms: 0.02x2 + -0.02x2 = 0.00
14 + -1.2x + -0.02x2 = 0.00

Begin completing the square.  Divide all terms by
-0.02 the coefficient of the squared term: 

Divide each side by '-0.02'.
-700 + 60x + x2 = 0

Move the constant term to the right:

Add '700' to each side of the equation.
-700 + 60x + 700 + x2 = 0 + 700

Reorder the terms:
-700 + 700 + 60x + x2 = 0 + 700

Combine like terms: -700 + 700 = 0
0 + 60x + x2 = 0 + 700
60x + x2 = 0 + 700

Combine like terms: 0 + 700 = 700
60x + x2 = 700

The x term is 60x.  Take half its coefficient (30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
60x + 900 + x2 = 700 + 900

Reorder the terms:
900 + 60x + x2 = 700 + 900

Combine like terms: 700 + 900 = 1600
900 + 60x + x2 = 1600

Factor a perfect square on the left side:
(x + 30)(x + 30) = 1600

Calculate the square root of the right side: 40

Break this problem into two subproblems by setting 
(x + 30) equal to 40 and -40.

Subproblem 1

x + 30 = 40 Simplifying x + 30 = 40 Reorder the terms: 30 + x = 40 Solving 30 + x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + x = 40 + -30 Combine like terms: 30 + -30 = 0 0 + x = 40 + -30 x = 40 + -30 Combine like terms: 40 + -30 = 10 x = 10 Simplifying x = 10

Subproblem 2

x + 30 = -40 Simplifying x + 30 = -40 Reorder the terms: 30 + x = -40 Solving 30 + x = -40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + x = -40 + -30 Combine like terms: 30 + -30 = 0 0 + x = -40 + -30 x = -40 + -30 Combine like terms: -40 + -30 = -70 x = -70 Simplifying x = -70

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10, -70}

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