0=4.9x^2+10x-10

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Solution for 0=4.9x^2+10x-10 equation:


Simplifying
0 = 4.9x2 + 10x + -10

Reorder the terms:
0 = -10 + 10x + 4.9x2

Solving
0 = -10 + 10x + 4.9x2

Solving for variable 'x'.

Combine like terms: 0 + 10 = 10
10 + -10x + -4.9x2 = -10 + 10x + 4.9x2 + 10 + -10x + -4.9x2

Reorder the terms:
10 + -10x + -4.9x2 = -10 + 10 + 10x + -10x + 4.9x2 + -4.9x2

Combine like terms: -10 + 10 = 0
10 + -10x + -4.9x2 = 0 + 10x + -10x + 4.9x2 + -4.9x2
10 + -10x + -4.9x2 = 10x + -10x + 4.9x2 + -4.9x2

Combine like terms: 10x + -10x = 0
10 + -10x + -4.9x2 = 0 + 4.9x2 + -4.9x2
10 + -10x + -4.9x2 = 4.9x2 + -4.9x2

Combine like terms: 4.9x2 + -4.9x2 = 0.0
10 + -10x + -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'.
-2.040816327 + 2.040816327x + x2 = 0

Move the constant term to the right:

Add '2.040816327' to each side of the equation.
-2.040816327 + 2.040816327x + 2.040816327 + x2 = 0 + 2.040816327

Reorder the terms:
-2.040816327 + 2.040816327 + 2.040816327x + x2 = 0 + 2.040816327

Combine like terms: -2.040816327 + 2.040816327 = 0.000000000
0.000000000 + 2.040816327x + x2 = 0 + 2.040816327
2.040816327x + x2 = 0 + 2.040816327

Combine like terms: 0 + 2.040816327 = 2.040816327
2.040816327x + x2 = 2.040816327

The x term is 2.040816327x.  Take half its coefficient (1.020408164).
Square it (1.041232821) and add it to both sides.

Add '1.041232821' to each side of the equation.
2.040816327x + 1.041232821 + x2 = 2.040816327 + 1.041232821

Reorder the terms:
1.041232821 + 2.040816327x + x2 = 2.040816327 + 1.041232821

Combine like terms: 2.040816327 + 1.041232821 = 3.082049148
1.041232821 + 2.040816327x + x2 = 3.082049148

Factor a perfect square on the left side:
(x + 1.020408164)(x + 1.020408164) = 3.082049148

Calculate the square root of the right side: 1.755576586

Break this problem into two subproblems by setting 
(x + 1.020408164) equal to 1.755576586 and -1.755576586.

Subproblem 1

x + 1.020408164 = 1.755576586 Simplifying x + 1.020408164 = 1.755576586 Reorder the terms: 1.020408164 + x = 1.755576586 Solving 1.020408164 + x = 1.755576586 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.020408164' to each side of the equation. 1.020408164 + -1.020408164 + x = 1.755576586 + -1.020408164 Combine like terms: 1.020408164 + -1.020408164 = 0.000000000 0.000000000 + x = 1.755576586 + -1.020408164 x = 1.755576586 + -1.020408164 Combine like terms: 1.755576586 + -1.020408164 = 0.735168422 x = 0.735168422 Simplifying x = 0.735168422

Subproblem 2

x + 1.020408164 = -1.755576586 Simplifying x + 1.020408164 = -1.755576586 Reorder the terms: 1.020408164 + x = -1.755576586 Solving 1.020408164 + x = -1.755576586 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.020408164' to each side of the equation. 1.020408164 + -1.020408164 + x = -1.755576586 + -1.020408164 Combine like terms: 1.020408164 + -1.020408164 = 0.000000000 0.000000000 + x = -1.755576586 + -1.020408164 x = -1.755576586 + -1.020408164 Combine like terms: -1.755576586 + -1.020408164 = -2.77598475 x = -2.77598475 Simplifying x = -2.77598475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.735168422, -2.77598475}

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