5.4x^2-2.7x-15.4=0

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Solution for 5.4x^2-2.7x-15.4=0 equation:


Simplifying
5.4x2 + -2.7x + -15.4 = 0

Reorder the terms:
-15.4 + -2.7x + 5.4x2 = 0

Solving
-15.4 + -2.7x + 5.4x2 = 0

Solving for variable 'x'.

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

Divide each side by '5.4'.
-2.851851852 + -0.5x + x2 = 0

Move the constant term to the right:

Add '2.851851852' to each side of the equation.
-2.851851852 + -0.5x + 2.851851852 + x2 = 0 + 2.851851852

Reorder the terms:
-2.851851852 + 2.851851852 + -0.5x + x2 = 0 + 2.851851852

Combine like terms: -2.851851852 + 2.851851852 = 0.000000000
0.000000000 + -0.5x + x2 = 0 + 2.851851852
-0.5x + x2 = 0 + 2.851851852

Combine like terms: 0 + 2.851851852 = 2.851851852
-0.5x + x2 = 2.851851852

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 2.851851852 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 2.851851852 + 0.0625

Combine like terms: 2.851851852 + 0.0625 = 2.914351852
0.0625 + -0.5x + x2 = 2.914351852

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 2.914351852

Calculate the square root of the right side: 1.707147285

Break this problem into two subproblems by setting 
(x + -0.25) equal to 1.707147285 and -1.707147285.

Subproblem 1

x + -0.25 = 1.707147285 Simplifying x + -0.25 = 1.707147285 Reorder the terms: -0.25 + x = 1.707147285 Solving -0.25 + x = 1.707147285 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 1.707147285 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 1.707147285 + 0.25 x = 1.707147285 + 0.25 Combine like terms: 1.707147285 + 0.25 = 1.957147285 x = 1.957147285 Simplifying x = 1.957147285

Subproblem 2

x + -0.25 = -1.707147285 Simplifying x + -0.25 = -1.707147285 Reorder the terms: -0.25 + x = -1.707147285 Solving -0.25 + x = -1.707147285 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -1.707147285 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -1.707147285 + 0.25 x = -1.707147285 + 0.25 Combine like terms: -1.707147285 + 0.25 = -1.457147285 x = -1.457147285 Simplifying x = -1.457147285

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.957147285, -1.457147285}

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