2.5x^2-3.7x-4.3=0

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Solution for 2.5x^2-3.7x-4.3=0 equation:


Simplifying
2.5x2 + -3.7x + -4.3 = 0

Reorder the terms:
-4.3 + -3.7x + 2.5x2 = 0

Solving
-4.3 + -3.7x + 2.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '2.5'.
-1.72 + -1.48x + x2 = 0

Move the constant term to the right:

Add '1.72' to each side of the equation.
-1.72 + -1.48x + 1.72 + x2 = 0 + 1.72

Reorder the terms:
-1.72 + 1.72 + -1.48x + x2 = 0 + 1.72

Combine like terms: -1.72 + 1.72 = 0.00
0.00 + -1.48x + x2 = 0 + 1.72
-1.48x + x2 = 0 + 1.72

Combine like terms: 0 + 1.72 = 1.72
-1.48x + x2 = 1.72

The x term is -1.48x.  Take half its coefficient (-0.74).
Square it (0.5476) and add it to both sides.

Add '0.5476' to each side of the equation.
-1.48x + 0.5476 + x2 = 1.72 + 0.5476

Reorder the terms:
0.5476 + -1.48x + x2 = 1.72 + 0.5476

Combine like terms: 1.72 + 0.5476 = 2.2676
0.5476 + -1.48x + x2 = 2.2676

Factor a perfect square on the left side:
(x + -0.74)(x + -0.74) = 2.2676

Calculate the square root of the right side: 1.505855239

Break this problem into two subproblems by setting 
(x + -0.74) equal to 1.505855239 and -1.505855239.

Subproblem 1

x + -0.74 = 1.505855239 Simplifying x + -0.74 = 1.505855239 Reorder the terms: -0.74 + x = 1.505855239 Solving -0.74 + x = 1.505855239 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.74' to each side of the equation. -0.74 + 0.74 + x = 1.505855239 + 0.74 Combine like terms: -0.74 + 0.74 = 0.00 0.00 + x = 1.505855239 + 0.74 x = 1.505855239 + 0.74 Combine like terms: 1.505855239 + 0.74 = 2.245855239 x = 2.245855239 Simplifying x = 2.245855239

Subproblem 2

x + -0.74 = -1.505855239 Simplifying x + -0.74 = -1.505855239 Reorder the terms: -0.74 + x = -1.505855239 Solving -0.74 + x = -1.505855239 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.74' to each side of the equation. -0.74 + 0.74 + x = -1.505855239 + 0.74 Combine like terms: -0.74 + 0.74 = 0.00 0.00 + x = -1.505855239 + 0.74 x = -1.505855239 + 0.74 Combine like terms: -1.505855239 + 0.74 = -0.765855239 x = -0.765855239 Simplifying x = -0.765855239

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.245855239, -0.765855239}

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