16x^2+40x-1.5=0

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


Simplifying
16x2 + 40x + -1.5 = 0

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

Solving
-1.5 + 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'.
-0.09375 + 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 = 0.036953768 x = 0.036953768 Simplifying x = 0.036953768

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 = -2.536953768 x = -2.536953768 Simplifying x = -2.536953768

Solution

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

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