0=1.2+x-0.025x^2

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Solution for 0=1.2+x-0.025x^2 equation:


Simplifying
0 = 1.2 + x + -0.025x2

Solving
0 = 1.2 + x + -0.025x2

Solving for variable 'x'.

Combine like terms: 0 + -1.2 = -1.2
-1.2 + -1x + 0.025x2 = 1.2 + x + -0.025x2 + -1.2 + -1x + 0.025x2

Reorder the terms:
-1.2 + -1x + 0.025x2 = 1.2 + -1.2 + x + -1x + -0.025x2 + 0.025x2

Combine like terms: 1.2 + -1.2 = 0.0
-1.2 + -1x + 0.025x2 = 0.0 + x + -1x + -0.025x2 + 0.025x2
-1.2 + -1x + 0.025x2 = x + -1x + -0.025x2 + 0.025x2

Combine like terms: x + -1x = 0
-1.2 + -1x + 0.025x2 = 0 + -0.025x2 + 0.025x2
-1.2 + -1x + 0.025x2 = -0.025x2 + 0.025x2

Combine like terms: -0.025x2 + 0.025x2 = 0.000
-1.2 + -1x + 0.025x2 = 0.000

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

Divide each side by '0.025'.
-48 + -40x + x2 = 0

Move the constant term to the right:

Add '48' to each side of the equation.
-48 + -40x + 48 + x2 = 0 + 48

Reorder the terms:
-48 + 48 + -40x + x2 = 0 + 48

Combine like terms: -48 + 48 = 0
0 + -40x + x2 = 0 + 48
-40x + x2 = 0 + 48

Combine like terms: 0 + 48 = 48
-40x + x2 = 48

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = 48 + 400

Reorder the terms:
400 + -40x + x2 = 48 + 400

Combine like terms: 48 + 400 = 448
400 + -40x + x2 = 448

Factor a perfect square on the left side:
(x + -20)(x + -20) = 448

Calculate the square root of the right side: 21.166010489

Break this problem into two subproblems by setting 
(x + -20) equal to 21.166010489 and -21.166010489.

Subproblem 1

x + -20 = 21.166010489 Simplifying x + -20 = 21.166010489 Reorder the terms: -20 + x = 21.166010489 Solving -20 + x = 21.166010489 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 21.166010489 + 20 Combine like terms: -20 + 20 = 0 0 + x = 21.166010489 + 20 x = 21.166010489 + 20 Combine like terms: 21.166010489 + 20 = 41.166010489 x = 41.166010489 Simplifying x = 41.166010489

Subproblem 2

x + -20 = -21.166010489 Simplifying x + -20 = -21.166010489 Reorder the terms: -20 + x = -21.166010489 Solving -20 + x = -21.166010489 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = -21.166010489 + 20 Combine like terms: -20 + 20 = 0 0 + x = -21.166010489 + 20 x = -21.166010489 + 20 Combine like terms: -21.166010489 + 20 = -1.166010489 x = -1.166010489 Simplifying x = -1.166010489

Solution

The solution to the problem is based on the solutions from the subproblems. x = {41.166010489, -1.166010489}

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