-4.9x^2+19x=11

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Solution for -4.9x^2+19x=11 equation:


Simplifying
-4.9x2 + 19x = 11

Reorder the terms:
19x + -4.9x2 = 11

Solving
19x + -4.9x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + 19x + -4.9x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 19x + -4.9x2 = 0

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

Divide each side by '-4.9'.
2.244897959 + -3.87755102x + x2 = 0

Move the constant term to the right:

Add '-2.244897959' to each side of the equation.
2.244897959 + -3.87755102x + -2.244897959 + x2 = 0 + -2.244897959

Reorder the terms:
2.244897959 + -2.244897959 + -3.87755102x + x2 = 0 + -2.244897959

Combine like terms: 2.244897959 + -2.244897959 = 0.000000000
0.000000000 + -3.87755102x + x2 = 0 + -2.244897959
-3.87755102x + x2 = 0 + -2.244897959

Combine like terms: 0 + -2.244897959 = -2.244897959
-3.87755102x + x2 = -2.244897959

The x term is -3.87755102x.  Take half its coefficient (-1.93877551).
Square it (3.758850478) and add it to both sides.

Add '3.758850478' to each side of the equation.
-3.87755102x + 3.758850478 + x2 = -2.244897959 + 3.758850478

Reorder the terms:
3.758850478 + -3.87755102x + x2 = -2.244897959 + 3.758850478

Combine like terms: -2.244897959 + 3.758850478 = 1.513952519
3.758850478 + -3.87755102x + x2 = 1.513952519

Factor a perfect square on the left side:
(x + -1.93877551)(x + -1.93877551) = 1.513952519

Calculate the square root of the right side: 1.230427779

Break this problem into two subproblems by setting 
(x + -1.93877551) equal to 1.230427779 and -1.230427779.

Subproblem 1

x + -1.93877551 = 1.230427779 Simplifying x + -1.93877551 = 1.230427779 Reorder the terms: -1.93877551 + x = 1.230427779 Solving -1.93877551 + x = 1.230427779 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.93877551' to each side of the equation. -1.93877551 + 1.93877551 + x = 1.230427779 + 1.93877551 Combine like terms: -1.93877551 + 1.93877551 = 0.00000000 0.00000000 + x = 1.230427779 + 1.93877551 x = 1.230427779 + 1.93877551 Combine like terms: 1.230427779 + 1.93877551 = 3.169203289 x = 3.169203289 Simplifying x = 3.169203289

Subproblem 2

x + -1.93877551 = -1.230427779 Simplifying x + -1.93877551 = -1.230427779 Reorder the terms: -1.93877551 + x = -1.230427779 Solving -1.93877551 + x = -1.230427779 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.93877551' to each side of the equation. -1.93877551 + 1.93877551 + x = -1.230427779 + 1.93877551 Combine like terms: -1.93877551 + 1.93877551 = 0.00000000 0.00000000 + x = -1.230427779 + 1.93877551 x = -1.230427779 + 1.93877551 Combine like terms: -1.230427779 + 1.93877551 = 0.708347731 x = 0.708347731 Simplifying x = 0.708347731

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.169203289, 0.708347731}

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