0=196+14.7x-4.9x^2

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Solution for 0=196+14.7x-4.9x^2 equation:


Simplifying
0 = 196 + 14.7x + -4.9x2

Solving
0 = 196 + 14.7x + -4.9x2

Solving for variable 'x'.

Combine like terms: 0 + -196 = -196
-196 + -14.7x + 4.9x2 = 196 + 14.7x + -4.9x2 + -196 + -14.7x + 4.9x2

Reorder the terms:
-196 + -14.7x + 4.9x2 = 196 + -196 + 14.7x + -14.7x + -4.9x2 + 4.9x2

Combine like terms: 196 + -196 = 0
-196 + -14.7x + 4.9x2 = 0 + 14.7x + -14.7x + -4.9x2 + 4.9x2
-196 + -14.7x + 4.9x2 = 14.7x + -14.7x + -4.9x2 + 4.9x2

Combine like terms: 14.7x + -14.7x = 0.0
-196 + -14.7x + 4.9x2 = 0.0 + -4.9x2 + 4.9x2
-196 + -14.7x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-196 + -14.7x + 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'.
-40 + -3x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -3x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -3x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -3x + x2 = 0 + 40
-3x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-3x + x2 = 40

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 40 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 40 + 2.25

Combine like terms: 40 + 2.25 = 42.25
2.25 + -3x + x2 = 42.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 42.25

Calculate the square root of the right side: 6.5

Break this problem into two subproblems by setting 
(x + -1.5) equal to 6.5 and -6.5.

Subproblem 1

x + -1.5 = 6.5 Simplifying x + -1.5 = 6.5 Reorder the terms: -1.5 + x = 6.5 Solving -1.5 + x = 6.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 6.5 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 6.5 + 1.5 x = 6.5 + 1.5 Combine like terms: 6.5 + 1.5 = 8 x = 8 Simplifying x = 8

Subproblem 2

x + -1.5 = -6.5 Simplifying x + -1.5 = -6.5 Reorder the terms: -1.5 + x = -6.5 Solving -1.5 + x = -6.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -6.5 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -6.5 + 1.5 x = -6.5 + 1.5 Combine like terms: -6.5 + 1.5 = -5 x = -5 Simplifying x = -5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, -5}

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