4.9x^2-x-135=0

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Solution for 4.9x^2-x-135=0 equation:


Simplifying
4.9x2 + -1x + -135 = 0

Reorder the terms:
-135 + -1x + 4.9x2 = 0

Solving
-135 + -1x + 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'.
-27.55102041 + -0.2040816327x + x2 = 0

Move the constant term to the right:

Add '27.55102041' to each side of the equation.
-27.55102041 + -0.2040816327x + 27.55102041 + x2 = 0 + 27.55102041

Reorder the terms:
-27.55102041 + 27.55102041 + -0.2040816327x + x2 = 0 + 27.55102041

Combine like terms: -27.55102041 + 27.55102041 = 0.00000000
0.00000000 + -0.2040816327x + x2 = 0 + 27.55102041
-0.2040816327x + x2 = 0 + 27.55102041

Combine like terms: 0 + 27.55102041 = 27.55102041
-0.2040816327x + x2 = 27.55102041

The x term is -0.2040816327x.  Take half its coefficient (-0.1020408164).
Square it (0.01041232821) and add it to both sides.

Add '0.01041232821' to each side of the equation.
-0.2040816327x + 0.01041232821 + x2 = 27.55102041 + 0.01041232821

Reorder the terms:
0.01041232821 + -0.2040816327x + x2 = 27.55102041 + 0.01041232821

Combine like terms: 27.55102041 + 0.01041232821 = 27.56143273821
0.01041232821 + -0.2040816327x + x2 = 27.56143273821

Factor a perfect square on the left side:
(x + -0.1020408164)(x + -0.1020408164) = 27.56143273821

Calculate the square root of the right side: 5.249898355

Break this problem into two subproblems by setting 
(x + -0.1020408164) equal to 5.249898355 and -5.249898355.

Subproblem 1

x + -0.1020408164 = 5.249898355 Simplifying x + -0.1020408164 = 5.249898355 Reorder the terms: -0.1020408164 + x = 5.249898355 Solving -0.1020408164 + x = 5.249898355 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1020408164' to each side of the equation. -0.1020408164 + 0.1020408164 + x = 5.249898355 + 0.1020408164 Combine like terms: -0.1020408164 + 0.1020408164 = 0.0000000000 0.0000000000 + x = 5.249898355 + 0.1020408164 x = 5.249898355 + 0.1020408164 Combine like terms: 5.249898355 + 0.1020408164 = 5.3519391714 x = 5.3519391714 Simplifying x = 5.3519391714

Subproblem 2

x + -0.1020408164 = -5.249898355 Simplifying x + -0.1020408164 = -5.249898355 Reorder the terms: -0.1020408164 + x = -5.249898355 Solving -0.1020408164 + x = -5.249898355 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1020408164' to each side of the equation. -0.1020408164 + 0.1020408164 + x = -5.249898355 + 0.1020408164 Combine like terms: -0.1020408164 + 0.1020408164 = 0.0000000000 0.0000000000 + x = -5.249898355 + 0.1020408164 x = -5.249898355 + 0.1020408164 Combine like terms: -5.249898355 + 0.1020408164 = -5.1478575386 x = -5.1478575386 Simplifying x = -5.1478575386

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.3519391714, -5.1478575386}

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