-16x^2+25x+5=4

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Solution for -16x^2+25x+5=4 equation:


Simplifying
-16x2 + 25x + 5 = 4

Reorder the terms:
5 + 25x + -16x2 = 4

Solving
5 + 25x + -16x2 = 4

Solving for variable 'x'.

Reorder the terms:
5 + -4 + 25x + -16x2 = 4 + -4

Combine like terms: 5 + -4 = 1
1 + 25x + -16x2 = 4 + -4

Combine like terms: 4 + -4 = 0
1 + 25x + -16x2 = 0

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

Divide each side by '-16'.
-0.0625 + -1.5625x + x2 = 0

Move the constant term to the right:

Add '0.0625' to each side of the equation.
-0.0625 + -1.5625x + 0.0625 + x2 = 0 + 0.0625

Reorder the terms:
-0.0625 + 0.0625 + -1.5625x + x2 = 0 + 0.0625

Combine like terms: -0.0625 + 0.0625 = 0.0000
0.0000 + -1.5625x + x2 = 0 + 0.0625
-1.5625x + x2 = 0 + 0.0625

Combine like terms: 0 + 0.0625 = 0.0625
-1.5625x + x2 = 0.0625

The x term is -1.5625x.  Take half its coefficient (-0.78125).
Square it (0.6103515625) and add it to both sides.

Add '0.6103515625' to each side of the equation.
-1.5625x + 0.6103515625 + x2 = 0.0625 + 0.6103515625

Reorder the terms:
0.6103515625 + -1.5625x + x2 = 0.0625 + 0.6103515625

Combine like terms: 0.0625 + 0.6103515625 = 0.6728515625
0.6103515625 + -1.5625x + x2 = 0.6728515625

Factor a perfect square on the left side:
(x + -0.78125)(x + -0.78125) = 0.6728515625

Calculate the square root of the right side: 0.820275297

Break this problem into two subproblems by setting 
(x + -0.78125) equal to 0.820275297 and -0.820275297.

Subproblem 1

x + -0.78125 = 0.820275297 Simplifying x + -0.78125 = 0.820275297 Reorder the terms: -0.78125 + x = 0.820275297 Solving -0.78125 + x = 0.820275297 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.78125' to each side of the equation. -0.78125 + 0.78125 + x = 0.820275297 + 0.78125 Combine like terms: -0.78125 + 0.78125 = 0.00000 0.00000 + x = 0.820275297 + 0.78125 x = 0.820275297 + 0.78125 Combine like terms: 0.820275297 + 0.78125 = 1.601525297 x = 1.601525297 Simplifying x = 1.601525297

Subproblem 2

x + -0.78125 = -0.820275297 Simplifying x + -0.78125 = -0.820275297 Reorder the terms: -0.78125 + x = -0.820275297 Solving -0.78125 + x = -0.820275297 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.78125' to each side of the equation. -0.78125 + 0.78125 + x = -0.820275297 + 0.78125 Combine like terms: -0.78125 + 0.78125 = 0.00000 0.00000 + x = -0.820275297 + 0.78125 x = -0.820275297 + 0.78125 Combine like terms: -0.820275297 + 0.78125 = -0.039025297 x = -0.039025297 Simplifying x = -0.039025297

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.601525297, -0.039025297}

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