4.9x^2+38x-625=0

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Solution for 4.9x^2+38x-625=0 equation:


Simplifying
4.9x2 + 38x + -625 = 0

Reorder the terms:
-625 + 38x + 4.9x2 = 0

Solving
-625 + 38x + 4.9x2 = 0

Solving for variable 'x'.

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

Divide each side by '4.9'.
-127.5510204 + 7.755102041x + x2 = 0

Move the constant term to the right:

Add '127.5510204' to each side of the equation.
-127.5510204 + 7.755102041x + 127.5510204 + x2 = 0 + 127.5510204

Reorder the terms:
-127.5510204 + 127.5510204 + 7.755102041x + x2 = 0 + 127.5510204

Combine like terms: -127.5510204 + 127.5510204 = 0.0000000
0.0000000 + 7.755102041x + x2 = 0 + 127.5510204
7.755102041x + x2 = 0 + 127.5510204

Combine like terms: 0 + 127.5510204 = 127.5510204
7.755102041x + x2 = 127.5510204

The x term is 7.755102041x.  Take half its coefficient (3.877551021).
Square it (15.03540192) and add it to both sides.

Add '15.03540192' to each side of the equation.
7.755102041x + 15.03540192 + x2 = 127.5510204 + 15.03540192

Reorder the terms:
15.03540192 + 7.755102041x + x2 = 127.5510204 + 15.03540192

Combine like terms: 127.5510204 + 15.03540192 = 142.58642232
15.03540192 + 7.755102041x + x2 = 142.58642232

Factor a perfect square on the left side:
(x + 3.877551021)(x + 3.877551021) = 142.58642232

Calculate the square root of the right side: 11.94095567

Break this problem into two subproblems by setting 
(x + 3.877551021) equal to 11.94095567 and -11.94095567.

Subproblem 1

x + 3.877551021 = 11.94095567 Simplifying x + 3.877551021 = 11.94095567 Reorder the terms: 3.877551021 + x = 11.94095567 Solving 3.877551021 + x = 11.94095567 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.877551021' to each side of the equation. 3.877551021 + -3.877551021 + x = 11.94095567 + -3.877551021 Combine like terms: 3.877551021 + -3.877551021 = 0.000000000 0.000000000 + x = 11.94095567 + -3.877551021 x = 11.94095567 + -3.877551021 Combine like terms: 11.94095567 + -3.877551021 = 8.063404649 x = 8.063404649 Simplifying x = 8.063404649

Subproblem 2

x + 3.877551021 = -11.94095567 Simplifying x + 3.877551021 = -11.94095567 Reorder the terms: 3.877551021 + x = -11.94095567 Solving 3.877551021 + x = -11.94095567 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.877551021' to each side of the equation. 3.877551021 + -3.877551021 + x = -11.94095567 + -3.877551021 Combine like terms: 3.877551021 + -3.877551021 = 0.000000000 0.000000000 + x = -11.94095567 + -3.877551021 x = -11.94095567 + -3.877551021 Combine like terms: -11.94095567 + -3.877551021 = -15.818506691 x = -15.818506691 Simplifying x = -15.818506691

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.063404649, -15.818506691}

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