2=-16x^2+45x+2.5

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Solution for 2=-16x^2+45x+2.5 equation:


Simplifying
2 = -16x2 + 45x + 2.5

Reorder the terms:
2 = 2.5 + 45x + -16x2

Solving
2 = 2.5 + 45x + -16x2

Solving for variable 'x'.

Combine like terms: 2 + -2.5 = -0.5
-0.5 + -45x + 16x2 = 2.5 + 45x + -16x2 + -2.5 + -45x + 16x2

Reorder the terms:
-0.5 + -45x + 16x2 = 2.5 + -2.5 + 45x + -45x + -16x2 + 16x2

Combine like terms: 2.5 + -2.5 = 0.0
-0.5 + -45x + 16x2 = 0.0 + 45x + -45x + -16x2 + 16x2
-0.5 + -45x + 16x2 = 45x + -45x + -16x2 + 16x2

Combine like terms: 45x + -45x = 0
-0.5 + -45x + 16x2 = 0 + -16x2 + 16x2
-0.5 + -45x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
-0.5 + -45x + 16x2 = 0

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

Divide each side by '16'.
-0.03125 + -2.8125x + x2 = 0

Move the constant term to the right:

Add '0.03125' to each side of the equation.
-0.03125 + -2.8125x + 0.03125 + x2 = 0 + 0.03125

Reorder the terms:
-0.03125 + 0.03125 + -2.8125x + x2 = 0 + 0.03125

Combine like terms: -0.03125 + 0.03125 = 0.00000
0.00000 + -2.8125x + x2 = 0 + 0.03125
-2.8125x + x2 = 0 + 0.03125

Combine like terms: 0 + 0.03125 = 0.03125
-2.8125x + x2 = 0.03125

The x term is -2.8125x.  Take half its coefficient (-1.40625).
Square it (1.977539063) and add it to both sides.

Add '1.977539063' to each side of the equation.
-2.8125x + 1.977539063 + x2 = 0.03125 + 1.977539063

Reorder the terms:
1.977539063 + -2.8125x + x2 = 0.03125 + 1.977539063

Combine like terms: 0.03125 + 1.977539063 = 2.008789063
1.977539063 + -2.8125x + x2 = 2.008789063

Factor a perfect square on the left side:
(x + -1.40625)(x + -1.40625) = 2.008789063

Calculate the square root of the right side: 1.417317559

Break this problem into two subproblems by setting 
(x + -1.40625) equal to 1.417317559 and -1.417317559.

Subproblem 1

x + -1.40625 = 1.417317559 Simplifying x + -1.40625 = 1.417317559 Reorder the terms: -1.40625 + x = 1.417317559 Solving -1.40625 + x = 1.417317559 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.40625' to each side of the equation. -1.40625 + 1.40625 + x = 1.417317559 + 1.40625 Combine like terms: -1.40625 + 1.40625 = 0.00000 0.00000 + x = 1.417317559 + 1.40625 x = 1.417317559 + 1.40625 Combine like terms: 1.417317559 + 1.40625 = 2.823567559 x = 2.823567559 Simplifying x = 2.823567559

Subproblem 2

x + -1.40625 = -1.417317559 Simplifying x + -1.40625 = -1.417317559 Reorder the terms: -1.40625 + x = -1.417317559 Solving -1.40625 + x = -1.417317559 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.40625' to each side of the equation. -1.40625 + 1.40625 + x = -1.417317559 + 1.40625 Combine like terms: -1.40625 + 1.40625 = 0.00000 0.00000 + x = -1.417317559 + 1.40625 x = -1.417317559 + 1.40625 Combine like terms: -1.417317559 + 1.40625 = -0.011067559 x = -0.011067559 Simplifying x = -0.011067559

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.823567559, -0.011067559}

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