98=5x+4.905x^2

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Solution for 98=5x+4.905x^2 equation:


Simplifying
98 = 5x + 4.905x2

Solving
98 = 5x + 4.905x2

Solving for variable 'x'.

Reorder the terms:
98 + -5x + -4.905x2 = 5x + -5x + 4.905x2 + -4.905x2

Combine like terms: 5x + -5x = 0
98 + -5x + -4.905x2 = 0 + 4.905x2 + -4.905x2
98 + -5x + -4.905x2 = 4.905x2 + -4.905x2

Combine like terms: 4.905x2 + -4.905x2 = 0.000
98 + -5x + -4.905x2 = 0.000

Begin completing the square.  Divide all terms by
-4.905 the coefficient of the squared term: 

Divide each side by '-4.905'.
-19.97961264 + 1.019367992x + x2 = 0

Move the constant term to the right:

Add '19.97961264' to each side of the equation.
-19.97961264 + 1.019367992x + 19.97961264 + x2 = 0 + 19.97961264

Reorder the terms:
-19.97961264 + 19.97961264 + 1.019367992x + x2 = 0 + 19.97961264

Combine like terms: -19.97961264 + 19.97961264 = 0.00000000
0.00000000 + 1.019367992x + x2 = 0 + 19.97961264
1.019367992x + x2 = 0 + 19.97961264

Combine like terms: 0 + 19.97961264 = 19.97961264
1.019367992x + x2 = 19.97961264

The x term is 1.019367992x.  Take half its coefficient (0.509683996).
Square it (0.2597777758) and add it to both sides.

Add '0.2597777758' to each side of the equation.
1.019367992x + 0.2597777758 + x2 = 19.97961264 + 0.2597777758

Reorder the terms:
0.2597777758 + 1.019367992x + x2 = 19.97961264 + 0.2597777758

Combine like terms: 19.97961264 + 0.2597777758 = 20.2393904158
0.2597777758 + 1.019367992x + x2 = 20.2393904158

Factor a perfect square on the left side:
(x + 0.509683996)(x + 0.509683996) = 20.2393904158

Calculate the square root of the right side: 4.498821003

Break this problem into two subproblems by setting 
(x + 0.509683996) equal to 4.498821003 and -4.498821003.

Subproblem 1

x + 0.509683996 = 4.498821003 Simplifying x + 0.509683996 = 4.498821003 Reorder the terms: 0.509683996 + x = 4.498821003 Solving 0.509683996 + x = 4.498821003 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.509683996' to each side of the equation. 0.509683996 + -0.509683996 + x = 4.498821003 + -0.509683996 Combine like terms: 0.509683996 + -0.509683996 = 0.000000000 0.000000000 + x = 4.498821003 + -0.509683996 x = 4.498821003 + -0.509683996 Combine like terms: 4.498821003 + -0.509683996 = 3.989137007 x = 3.989137007 Simplifying x = 3.989137007

Subproblem 2

x + 0.509683996 = -4.498821003 Simplifying x + 0.509683996 = -4.498821003 Reorder the terms: 0.509683996 + x = -4.498821003 Solving 0.509683996 + x = -4.498821003 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.509683996' to each side of the equation. 0.509683996 + -0.509683996 + x = -4.498821003 + -0.509683996 Combine like terms: 0.509683996 + -0.509683996 = 0.000000000 0.000000000 + x = -4.498821003 + -0.509683996 x = -4.498821003 + -0.509683996 Combine like terms: -4.498821003 + -0.509683996 = -5.008504999 x = -5.008504999 Simplifying x = -5.008504999

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.989137007, -5.008504999}

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