0=-4.9x^2+12x+300

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Solution for 0=-4.9x^2+12x+300 equation:


Simplifying
0 = -4.9x2 + 12x + 300

Reorder the terms:
0 = 300 + 12x + -4.9x2

Solving
0 = 300 + 12x + -4.9x2

Solving for variable 'x'.

Combine like terms: 0 + -300 = -300
-300 + -12x + 4.9x2 = 300 + 12x + -4.9x2 + -300 + -12x + 4.9x2

Reorder the terms:
-300 + -12x + 4.9x2 = 300 + -300 + 12x + -12x + -4.9x2 + 4.9x2

Combine like terms: 300 + -300 = 0
-300 + -12x + 4.9x2 = 0 + 12x + -12x + -4.9x2 + 4.9x2
-300 + -12x + 4.9x2 = 12x + -12x + -4.9x2 + 4.9x2

Combine like terms: 12x + -12x = 0
-300 + -12x + 4.9x2 = 0 + -4.9x2 + 4.9x2
-300 + -12x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-300 + -12x + 4.9x2 = 0.0

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

Divide each side by '4.9'.
-61.2244898 + -2.448979592x + x2 = 0

Move the constant term to the right:

Add '61.2244898' to each side of the equation.
-61.2244898 + -2.448979592x + 61.2244898 + x2 = 0 + 61.2244898

Reorder the terms:
-61.2244898 + 61.2244898 + -2.448979592x + x2 = 0 + 61.2244898

Combine like terms: -61.2244898 + 61.2244898 = 0.0000000
0.0000000 + -2.448979592x + x2 = 0 + 61.2244898
-2.448979592x + x2 = 0 + 61.2244898

Combine like terms: 0 + 61.2244898 = 61.2244898
-2.448979592x + x2 = 61.2244898

The x term is -2.448979592x.  Take half its coefficient (-1.224489796).
Square it (1.499375261) and add it to both sides.

Add '1.499375261' to each side of the equation.
-2.448979592x + 1.499375261 + x2 = 61.2244898 + 1.499375261

Reorder the terms:
1.499375261 + -2.448979592x + x2 = 61.2244898 + 1.499375261

Combine like terms: 61.2244898 + 1.499375261 = 62.723865061
1.499375261 + -2.448979592x + x2 = 62.723865061

Factor a perfect square on the left side:
(x + -1.224489796)(x + -1.224489796) = 62.723865061

Calculate the square root of the right side: 7.919839964

Break this problem into two subproblems by setting 
(x + -1.224489796) equal to 7.919839964 and -7.919839964.

Subproblem 1

x + -1.224489796 = 7.919839964 Simplifying x + -1.224489796 = 7.919839964 Reorder the terms: -1.224489796 + x = 7.919839964 Solving -1.224489796 + x = 7.919839964 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.224489796' to each side of the equation. -1.224489796 + 1.224489796 + x = 7.919839964 + 1.224489796 Combine like terms: -1.224489796 + 1.224489796 = 0.000000000 0.000000000 + x = 7.919839964 + 1.224489796 x = 7.919839964 + 1.224489796 Combine like terms: 7.919839964 + 1.224489796 = 9.14432976 x = 9.14432976 Simplifying x = 9.14432976

Subproblem 2

x + -1.224489796 = -7.919839964 Simplifying x + -1.224489796 = -7.919839964 Reorder the terms: -1.224489796 + x = -7.919839964 Solving -1.224489796 + x = -7.919839964 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.224489796' to each side of the equation. -1.224489796 + 1.224489796 + x = -7.919839964 + 1.224489796 Combine like terms: -1.224489796 + 1.224489796 = 0.000000000 0.000000000 + x = -7.919839964 + 1.224489796 x = -7.919839964 + 1.224489796 Combine like terms: -7.919839964 + 1.224489796 = -6.695350168 x = -6.695350168 Simplifying x = -6.695350168

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.14432976, -6.695350168}

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