58.8=-4.9x^2+34.3x+0

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Solution for 58.8=-4.9x^2+34.3x+0 equation:


Simplifying
58.8 = -4.9x2 + 34.3x + 0

Reorder the terms:
58.8 = 0 + 34.3x + -4.9x2
Remove the zero:
58.8 = 34.3x + -4.9x2

Solving
58.8 = 34.3x + -4.9x2

Solving for variable 'x'.

Reorder the terms:
58.8 + -34.3x + 4.9x2 = 34.3x + -34.3x + -4.9x2 + 4.9x2

Combine like terms: 34.3x + -34.3x = 0.0
58.8 + -34.3x + 4.9x2 = 0.0 + -4.9x2 + 4.9x2
58.8 + -34.3x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
58.8 + -34.3x + 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'.
12 + -7x + x2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -7x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + -7x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -7x + x2 = 0 + -12
-7x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
-7x + x2 = -12

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = -12 + 12.25

Reorder the terms:
12.25 + -7x + x2 = -12 + 12.25

Combine like terms: -12 + 12.25 = 0.25
12.25 + -7x + x2 = 0.25

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 0.25

Calculate the square root of the right side: 0.5

Break this problem into two subproblems by setting 
(x + -3.5) equal to 0.5 and -0.5.

Subproblem 1

x + -3.5 = 0.5 Simplifying x + -3.5 = 0.5 Reorder the terms: -3.5 + x = 0.5 Solving -3.5 + x = 0.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 0.5 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 0.5 + 3.5 x = 0.5 + 3.5 Combine like terms: 0.5 + 3.5 = 4 x = 4 Simplifying x = 4

Subproblem 2

x + -3.5 = -0.5 Simplifying x + -3.5 = -0.5 Reorder the terms: -3.5 + x = -0.5 Solving -3.5 + x = -0.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -0.5 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -0.5 + 3.5 x = -0.5 + 3.5 Combine like terms: -0.5 + 3.5 = 3 x = 3 Simplifying x = 3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4, 3}

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