25x^2-x-16=0

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Solution for 25x^2-x-16=0 equation:


Simplifying
25x2 + -1x + -16 = 0

Reorder the terms:
-16 + -1x + 25x2 = 0

Solving
-16 + -1x + 25x2 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
-0.64 + -0.04x + x2 = 0

Move the constant term to the right:

Add '0.64' to each side of the equation.
-0.64 + -0.04x + 0.64 + x2 = 0 + 0.64

Reorder the terms:
-0.64 + 0.64 + -0.04x + x2 = 0 + 0.64

Combine like terms: -0.64 + 0.64 = 0.00
0.00 + -0.04x + x2 = 0 + 0.64
-0.04x + x2 = 0 + 0.64

Combine like terms: 0 + 0.64 = 0.64
-0.04x + x2 = 0.64

The x term is -0.04x.  Take half its coefficient (-0.02).
Square it (0.0004) and add it to both sides.

Add '0.0004' to each side of the equation.
-0.04x + 0.0004 + x2 = 0.64 + 0.0004

Reorder the terms:
0.0004 + -0.04x + x2 = 0.64 + 0.0004

Combine like terms: 0.64 + 0.0004 = 0.6404
0.0004 + -0.04x + x2 = 0.6404

Factor a perfect square on the left side:
(x + -0.02)(x + -0.02) = 0.6404

Calculate the square root of the right side: 0.800249961

Break this problem into two subproblems by setting 
(x + -0.02) equal to 0.800249961 and -0.800249961.

Subproblem 1

x + -0.02 = 0.800249961 Simplifying x + -0.02 = 0.800249961 Reorder the terms: -0.02 + x = 0.800249961 Solving -0.02 + x = 0.800249961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.02' to each side of the equation. -0.02 + 0.02 + x = 0.800249961 + 0.02 Combine like terms: -0.02 + 0.02 = 0.00 0.00 + x = 0.800249961 + 0.02 x = 0.800249961 + 0.02 Combine like terms: 0.800249961 + 0.02 = 0.820249961 x = 0.820249961 Simplifying x = 0.820249961

Subproblem 2

x + -0.02 = -0.800249961 Simplifying x + -0.02 = -0.800249961 Reorder the terms: -0.02 + x = -0.800249961 Solving -0.02 + x = -0.800249961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.02' to each side of the equation. -0.02 + 0.02 + x = -0.800249961 + 0.02 Combine like terms: -0.02 + 0.02 = 0.00 0.00 + x = -0.800249961 + 0.02 x = -0.800249961 + 0.02 Combine like terms: -0.800249961 + 0.02 = -0.780249961 x = -0.780249961 Simplifying x = -0.780249961

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.820249961, -0.780249961}

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