0=-16x^2+40x+1.5

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Solution for 0=-16x^2+40x+1.5 equation:


Simplifying
0 = -16x2 + 40x + 1.5

Reorder the terms:
0 = 1.5 + 40x + -16x2

Solving
0 = 1.5 + 40x + -16x2

Solving for variable 'x'.

Combine like terms: 0 + -1.5 = -1.5
-1.5 + -40x + 16x2 = 1.5 + 40x + -16x2 + -1.5 + -40x + 16x2

Reorder the terms:
-1.5 + -40x + 16x2 = 1.5 + -1.5 + 40x + -40x + -16x2 + 16x2

Combine like terms: 1.5 + -1.5 = 0.0
-1.5 + -40x + 16x2 = 0.0 + 40x + -40x + -16x2 + 16x2
-1.5 + -40x + 16x2 = 40x + -40x + -16x2 + 16x2

Combine like terms: 40x + -40x = 0
-1.5 + -40x + 16x2 = 0 + -16x2 + 16x2
-1.5 + -40x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
-1.5 + -40x + 16x2 = 0

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

Divide each side by '16'.
-0.09375 + -2.5x + x2 = 0

Move the constant term to the right:

Add '0.09375' to each side of the equation.
-0.09375 + -2.5x + 0.09375 + x2 = 0 + 0.09375

Reorder the terms:
-0.09375 + 0.09375 + -2.5x + x2 = 0 + 0.09375

Combine like terms: -0.09375 + 0.09375 = 0.00000
0.00000 + -2.5x + x2 = 0 + 0.09375
-2.5x + x2 = 0 + 0.09375

Combine like terms: 0 + 0.09375 = 0.09375
-2.5x + x2 = 0.09375

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 = 0.09375 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 0.09375 + 1.5625

Combine like terms: 0.09375 + 1.5625 = 1.65625
1.5625 + -2.5x + x2 = 1.65625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 1.65625

Calculate the square root of the right side: 1.286953768

Break this problem into two subproblems by setting 
(x + -1.25) equal to 1.286953768 and -1.286953768.

Subproblem 1

x + -1.25 = 1.286953768 Simplifying x + -1.25 = 1.286953768 Reorder the terms: -1.25 + x = 1.286953768 Solving -1.25 + x = 1.286953768 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 = 1.286953768 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 1.286953768 + 1.25 x = 1.286953768 + 1.25 Combine like terms: 1.286953768 + 1.25 = 2.536953768 x = 2.536953768 Simplifying x = 2.536953768

Subproblem 2

x + -1.25 = -1.286953768 Simplifying x + -1.25 = -1.286953768 Reorder the terms: -1.25 + x = -1.286953768 Solving -1.25 + x = -1.286953768 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 = -1.286953768 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -1.286953768 + 1.25 x = -1.286953768 + 1.25 Combine like terms: -1.286953768 + 1.25 = -0.036953768 x = -0.036953768 Simplifying x = -0.036953768

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.536953768, -0.036953768}

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