1.25(x^2)-3.8x-7.6=0

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Solution for 1.25(x^2)-3.8x-7.6=0 equation:


Simplifying
1.25(x2) + -3.8x + -7.6 = 0

Reorder the terms:
-7.6 + -3.8x + 1.25x2 = 0

Solving
-7.6 + -3.8x + 1.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '1.25'.
-6.08 + -3.04x + x2 = 0

Move the constant term to the right:

Add '6.08' to each side of the equation.
-6.08 + -3.04x + 6.08 + x2 = 0 + 6.08

Reorder the terms:
-6.08 + 6.08 + -3.04x + x2 = 0 + 6.08

Combine like terms: -6.08 + 6.08 = 0.00
0.00 + -3.04x + x2 = 0 + 6.08
-3.04x + x2 = 0 + 6.08

Combine like terms: 0 + 6.08 = 6.08
-3.04x + x2 = 6.08

The x term is -3.04x.  Take half its coefficient (-1.52).
Square it (2.3104) and add it to both sides.

Add '2.3104' to each side of the equation.
-3.04x + 2.3104 + x2 = 6.08 + 2.3104

Reorder the terms:
2.3104 + -3.04x + x2 = 6.08 + 2.3104

Combine like terms: 6.08 + 2.3104 = 8.3904
2.3104 + -3.04x + x2 = 8.3904

Factor a perfect square on the left side:
(x + -1.52)(x + -1.52) = 8.3904

Calculate the square root of the right side: 2.896618718

Break this problem into two subproblems by setting 
(x + -1.52) equal to 2.896618718 and -2.896618718.

Subproblem 1

x + -1.52 = 2.896618718 Simplifying x + -1.52 = 2.896618718 Reorder the terms: -1.52 + x = 2.896618718 Solving -1.52 + x = 2.896618718 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.52' to each side of the equation. -1.52 + 1.52 + x = 2.896618718 + 1.52 Combine like terms: -1.52 + 1.52 = 0.00 0.00 + x = 2.896618718 + 1.52 x = 2.896618718 + 1.52 Combine like terms: 2.896618718 + 1.52 = 4.416618718 x = 4.416618718 Simplifying x = 4.416618718

Subproblem 2

x + -1.52 = -2.896618718 Simplifying x + -1.52 = -2.896618718 Reorder the terms: -1.52 + x = -2.896618718 Solving -1.52 + x = -2.896618718 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.52' to each side of the equation. -1.52 + 1.52 + x = -2.896618718 + 1.52 Combine like terms: -1.52 + 1.52 = 0.00 0.00 + x = -2.896618718 + 1.52 x = -2.896618718 + 1.52 Combine like terms: -2.896618718 + 1.52 = -1.376618718 x = -1.376618718 Simplifying x = -1.376618718

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.416618718, -1.376618718}

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