0=-4.9x^2-1.8x+50

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Solution for 0=-4.9x^2-1.8x+50 equation:


Simplifying
0 = -4.9x2 + -1.8x + 50

Reorder the terms:
0 = 50 + -1.8x + -4.9x2

Solving
0 = 50 + -1.8x + -4.9x2

Solving for variable 'x'.

Combine like terms: 0 + -50 = -50
-50 + 1.8x + 4.9x2 = 50 + -1.8x + -4.9x2 + -50 + 1.8x + 4.9x2

Reorder the terms:
-50 + 1.8x + 4.9x2 = 50 + -50 + -1.8x + 1.8x + -4.9x2 + 4.9x2

Combine like terms: 50 + -50 = 0
-50 + 1.8x + 4.9x2 = 0 + -1.8x + 1.8x + -4.9x2 + 4.9x2
-50 + 1.8x + 4.9x2 = -1.8x + 1.8x + -4.9x2 + 4.9x2

Combine like terms: -1.8x + 1.8x = 0.0
-50 + 1.8x + 4.9x2 = 0.0 + -4.9x2 + 4.9x2
-50 + 1.8x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-50 + 1.8x + 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'.
-10.20408163 + 0.3673469388x + x2 = 0

Move the constant term to the right:

Add '10.20408163' to each side of the equation.
-10.20408163 + 0.3673469388x + 10.20408163 + x2 = 0 + 10.20408163

Reorder the terms:
-10.20408163 + 10.20408163 + 0.3673469388x + x2 = 0 + 10.20408163

Combine like terms: -10.20408163 + 10.20408163 = 0.00000000
0.00000000 + 0.3673469388x + x2 = 0 + 10.20408163
0.3673469388x + x2 = 0 + 10.20408163

Combine like terms: 0 + 10.20408163 = 10.20408163
0.3673469388x + x2 = 10.20408163

The x term is 0.3673469388x.  Take half its coefficient (0.1836734694).
Square it (0.03373594336) and add it to both sides.

Add '0.03373594336' to each side of the equation.
0.3673469388x + 0.03373594336 + x2 = 10.20408163 + 0.03373594336

Reorder the terms:
0.03373594336 + 0.3673469388x + x2 = 10.20408163 + 0.03373594336

Combine like terms: 10.20408163 + 0.03373594336 = 10.23781757336
0.03373594336 + 0.3673469388x + x2 = 10.23781757336

Factor a perfect square on the left side:
(x + 0.1836734694)(x + 0.1836734694) = 10.23781757336

Calculate the square root of the right side: 3.199658978

Break this problem into two subproblems by setting 
(x + 0.1836734694) equal to 3.199658978 and -3.199658978.

Subproblem 1

x + 0.1836734694 = 3.199658978 Simplifying x + 0.1836734694 = 3.199658978 Reorder the terms: 0.1836734694 + x = 3.199658978 Solving 0.1836734694 + x = 3.199658978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1836734694' to each side of the equation. 0.1836734694 + -0.1836734694 + x = 3.199658978 + -0.1836734694 Combine like terms: 0.1836734694 + -0.1836734694 = 0.0000000000 0.0000000000 + x = 3.199658978 + -0.1836734694 x = 3.199658978 + -0.1836734694 Combine like terms: 3.199658978 + -0.1836734694 = 3.0159855086 x = 3.0159855086 Simplifying x = 3.0159855086

Subproblem 2

x + 0.1836734694 = -3.199658978 Simplifying x + 0.1836734694 = -3.199658978 Reorder the terms: 0.1836734694 + x = -3.199658978 Solving 0.1836734694 + x = -3.199658978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1836734694' to each side of the equation. 0.1836734694 + -0.1836734694 + x = -3.199658978 + -0.1836734694 Combine like terms: 0.1836734694 + -0.1836734694 = 0.0000000000 0.0000000000 + x = -3.199658978 + -0.1836734694 x = -3.199658978 + -0.1836734694 Combine like terms: -3.199658978 + -0.1836734694 = -3.3833324474 x = -3.3833324474 Simplifying x = -3.3833324474

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.0159855086, -3.3833324474}

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