-10x+0.25x^2=1600

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Solution for -10x+0.25x^2=1600 equation:


Simplifying
-10x + 0.25x2 = 1600

Solving
-10x + 0.25x2 = 1600

Solving for variable 'x'.

Reorder the terms:
-1600 + -10x + 0.25x2 = 1600 + -1600

Combine like terms: 1600 + -1600 = 0
-1600 + -10x + 0.25x2 = 0

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

Divide each side by '0.25'.
-6400 + -40x + x2 = 0

Move the constant term to the right:

Add '6400' to each side of the equation.
-6400 + -40x + 6400 + x2 = 0 + 6400

Reorder the terms:
-6400 + 6400 + -40x + x2 = 0 + 6400

Combine like terms: -6400 + 6400 = 0
0 + -40x + x2 = 0 + 6400
-40x + x2 = 0 + 6400

Combine like terms: 0 + 6400 = 6400
-40x + x2 = 6400

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = 6400 + 400

Reorder the terms:
400 + -40x + x2 = 6400 + 400

Combine like terms: 6400 + 400 = 6800
400 + -40x + x2 = 6800

Factor a perfect square on the left side:
(x + -20)(x + -20) = 6800

Calculate the square root of the right side: 82.462112512

Break this problem into two subproblems by setting 
(x + -20) equal to 82.462112512 and -82.462112512.

Subproblem 1

x + -20 = 82.462112512 Simplifying x + -20 = 82.462112512 Reorder the terms: -20 + x = 82.462112512 Solving -20 + x = 82.462112512 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 82.462112512 + 20 Combine like terms: -20 + 20 = 0 0 + x = 82.462112512 + 20 x = 82.462112512 + 20 Combine like terms: 82.462112512 + 20 = 102.462112512 x = 102.462112512 Simplifying x = 102.462112512

Subproblem 2

x + -20 = -82.462112512 Simplifying x + -20 = -82.462112512 Reorder the terms: -20 + x = -82.462112512 Solving -20 + x = -82.462112512 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = -82.462112512 + 20 Combine like terms: -20 + 20 = 0 0 + x = -82.462112512 + 20 x = -82.462112512 + 20 Combine like terms: -82.462112512 + 20 = -62.462112512 x = -62.462112512 Simplifying x = -62.462112512

Solution

The solution to the problem is based on the solutions from the subproblems. x = {102.462112512, -62.462112512}

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