0=(-4.9x^2)+14x+38

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Solution for 0=(-4.9x^2)+14x+38 equation:


Simplifying
0 = (-4.9x2) + 14x + 38

Reorder the terms:
0 = 38 + 14x + (-4.9x2)

Solving
0 = 38 + 14x + (-4.9x2)

Solving for variable 'x'.

Combine like terms: 0 + -38 = -38
-38 + -14x + (4.9x2) = 38 + 14x + (-4.9x2) + -38 + -14x + (4.9x2)

Reorder the terms:
-38 + -14x + (4.9x2) = 38 + -38 + 14x + -14x + (-4.9x2) + (4.9x2)

Combine like terms: 38 + -38 = 0
-38 + -14x + (4.9x2) = 0 + 14x + -14x + (-4.9x2) + (4.9x2)
-38 + -14x + (4.9x2) = 14x + -14x + (-4.9x2) + (4.9x2)

Combine like terms: 14x + -14x = 0
-38 + -14x + (4.9x2) = 0 + (-4.9x2) + (4.9x2)
-38 + -14x + (4.9x2) = (-4.9x2) + (4.9x2)

Combine like terms: (-4.9x2) + (4.9x2) = 0.0
-38 + -14x + (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'.
-7.755102041 + -2.857142857x + x2 = 0

Move the constant term to the right:

Add '7.755102041' to each side of the equation.
-7.755102041 + -2.857142857x + 7.755102041 + x2 = 0 + 7.755102041

Reorder the terms:
-7.755102041 + 7.755102041 + -2.857142857x + x2 = 0 + 7.755102041

Combine like terms: -7.755102041 + 7.755102041 = 0.000000000
0.000000000 + -2.857142857x + x2 = 0 + 7.755102041
-2.857142857x + x2 = 0 + 7.755102041

Combine like terms: 0 + 7.755102041 = 7.755102041
-2.857142857x + x2 = 7.755102041

The x term is -2.857142857x.  Take half its coefficient (-1.428571429).
Square it (2.040816328) and add it to both sides.

Add '2.040816328' to each side of the equation.
-2.857142857x + 2.040816328 + x2 = 7.755102041 + 2.040816328

Reorder the terms:
2.040816328 + -2.857142857x + x2 = 7.755102041 + 2.040816328

Combine like terms: 7.755102041 + 2.040816328 = 9.795918369
2.040816328 + -2.857142857x + x2 = 9.795918369

Factor a perfect square on the left side:
((x) + -1.428571429)((x) + -1.428571429) = 9.795918369

Calculate the square root of the right side: 3.129843186

Break this problem into two subproblems by setting 
((x) + -1.428571429) equal to 3.129843186 and -3.129843186.

Subproblem 1

(x) + -1.428571429 = 3.129843186 Simplifying (x) + -1.428571429 = 3.129843186 x + -1.428571429 = 3.129843186 Reorder the terms: -1.428571429 + x = 3.129843186 Solving -1.428571429 + x = 3.129843186 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.428571429' to each side of the equation. -1.428571429 + 1.428571429 + x = 3.129843186 + 1.428571429 Combine like terms: -1.428571429 + 1.428571429 = 0.000000000 0.000000000 + x = 3.129843186 + 1.428571429 x = 3.129843186 + 1.428571429 Combine like terms: 3.129843186 + 1.428571429 = 4.558414615 x = 4.558414615 Simplifying x = 4.558414615

Subproblem 2

(x) + -1.428571429 = -3.129843186 Simplifying (x) + -1.428571429 = -3.129843186 x + -1.428571429 = -3.129843186 Reorder the terms: -1.428571429 + x = -3.129843186 Solving -1.428571429 + x = -3.129843186 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.428571429' to each side of the equation. -1.428571429 + 1.428571429 + x = -3.129843186 + 1.428571429 Combine like terms: -1.428571429 + 1.428571429 = 0.000000000 0.000000000 + x = -3.129843186 + 1.428571429 x = -3.129843186 + 1.428571429 Combine like terms: -3.129843186 + 1.428571429 = -1.701271757 x = -1.701271757 Simplifying x = -1.701271757

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.558414615, -1.701271757}

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