-16x^2+40x+5.5=0

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Solution for -16x^2+40x+5.5=0 equation:


Simplifying
-16x2 + 40x + 5.5 = 0

Reorder the terms:
5.5 + 40x + -16x2 = 0

Solving
5.5 + 40x + -16x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-0.34375 + -2.5x + x2 = 0

Move the constant term to the right:

Add '0.34375' to each side of the equation.
-0.34375 + -2.5x + 0.34375 + x2 = 0 + 0.34375

Reorder the terms:
-0.34375 + 0.34375 + -2.5x + x2 = 0 + 0.34375

Combine like terms: -0.34375 + 0.34375 = 0.00000
0.00000 + -2.5x + x2 = 0 + 0.34375
-2.5x + x2 = 0 + 0.34375

Combine like terms: 0 + 0.34375 = 0.34375
-2.5x + x2 = 0.34375

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 0.34375 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 0.34375 + 1.5625

Combine like terms: 0.34375 + 1.5625 = 1.90625
1.5625 + -2.5x + x2 = 1.90625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 1.90625

Calculate the square root of the right side: 1.380670127

Break this problem into two subproblems by setting 
(x + -1.25) equal to 1.380670127 and -1.380670127.

Subproblem 1

x + -1.25 = 1.380670127 Simplifying x + -1.25 = 1.380670127 Reorder the terms: -1.25 + x = 1.380670127 Solving -1.25 + x = 1.380670127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 1.380670127 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 1.380670127 + 1.25 x = 1.380670127 + 1.25 Combine like terms: 1.380670127 + 1.25 = 2.630670127 x = 2.630670127 Simplifying x = 2.630670127

Subproblem 2

x + -1.25 = -1.380670127 Simplifying x + -1.25 = -1.380670127 Reorder the terms: -1.25 + x = -1.380670127 Solving -1.25 + x = -1.380670127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -1.380670127 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -1.380670127 + 1.25 x = -1.380670127 + 1.25 Combine like terms: -1.380670127 + 1.25 = -0.130670127 x = -0.130670127 Simplifying x = -0.130670127

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.630670127, -0.130670127}

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