-9.8x^2+40x+60=0

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Solution for -9.8x^2+40x+60=0 equation:


Simplifying
-9.8x2 + 40x + 60 = 0

Reorder the terms:
60 + 40x + -9.8x2 = 0

Solving
60 + 40x + -9.8x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-9.8 the coefficient of the squared term: 

Divide each side by '-9.8'.
-6.12244898 + -4.081632653x + x2 = 0

Move the constant term to the right:

Add '6.12244898' to each side of the equation.
-6.12244898 + -4.081632653x + 6.12244898 + x2 = 0 + 6.12244898

Reorder the terms:
-6.12244898 + 6.12244898 + -4.081632653x + x2 = 0 + 6.12244898

Combine like terms: -6.12244898 + 6.12244898 = 0.00000000
0.00000000 + -4.081632653x + x2 = 0 + 6.12244898
-4.081632653x + x2 = 0 + 6.12244898

Combine like terms: 0 + 6.12244898 = 6.12244898
-4.081632653x + x2 = 6.12244898

The x term is -4.081632653x.  Take half its coefficient (-2.040816327).
Square it (4.164931281) and add it to both sides.

Add '4.164931281' to each side of the equation.
-4.081632653x + 4.164931281 + x2 = 6.12244898 + 4.164931281

Reorder the terms:
4.164931281 + -4.081632653x + x2 = 6.12244898 + 4.164931281

Combine like terms: 6.12244898 + 4.164931281 = 10.287380261
4.164931281 + -4.081632653x + x2 = 10.287380261

Factor a perfect square on the left side:
(x + -2.040816327)(x + -2.040816327) = 10.287380261

Calculate the square root of the right side: 3.207394622

Break this problem into two subproblems by setting 
(x + -2.040816327) equal to 3.207394622 and -3.207394622.

Subproblem 1

x + -2.040816327 = 3.207394622 Simplifying x + -2.040816327 = 3.207394622 Reorder the terms: -2.040816327 + x = 3.207394622 Solving -2.040816327 + x = 3.207394622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.040816327' to each side of the equation. -2.040816327 + 2.040816327 + x = 3.207394622 + 2.040816327 Combine like terms: -2.040816327 + 2.040816327 = 0.000000000 0.000000000 + x = 3.207394622 + 2.040816327 x = 3.207394622 + 2.040816327 Combine like terms: 3.207394622 + 2.040816327 = 5.248210949 x = 5.248210949 Simplifying x = 5.248210949

Subproblem 2

x + -2.040816327 = -3.207394622 Simplifying x + -2.040816327 = -3.207394622 Reorder the terms: -2.040816327 + x = -3.207394622 Solving -2.040816327 + x = -3.207394622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.040816327' to each side of the equation. -2.040816327 + 2.040816327 + x = -3.207394622 + 2.040816327 Combine like terms: -2.040816327 + 2.040816327 = 0.000000000 0.000000000 + x = -3.207394622 + 2.040816327 x = -3.207394622 + 2.040816327 Combine like terms: -3.207394622 + 2.040816327 = -1.166578295 x = -1.166578295 Simplifying x = -1.166578295

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.248210949, -1.166578295}

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