900-0.25x^2=100+10x

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Solution for 900-0.25x^2=100+10x equation:


Simplifying
900 + -0.25x2 = 100 + 10x

Solving
900 + -0.25x2 = 100 + 10x

Solving for variable 'x'.

Reorder the terms:
900 + -100 + -10x + -0.25x2 = 100 + 10x + -100 + -10x

Combine like terms: 900 + -100 = 800
800 + -10x + -0.25x2 = 100 + 10x + -100 + -10x

Reorder the terms:
800 + -10x + -0.25x2 = 100 + -100 + 10x + -10x

Combine like terms: 100 + -100 = 0
800 + -10x + -0.25x2 = 0 + 10x + -10x
800 + -10x + -0.25x2 = 10x + -10x

Combine like terms: 10x + -10x = 0
800 + -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'.
-3200 + 40x + x2 = 0

Move the constant term to the right:

Add '3200' to each side of the equation.
-3200 + 40x + 3200 + x2 = 0 + 3200

Reorder the terms:
-3200 + 3200 + 40x + x2 = 0 + 3200

Combine like terms: -3200 + 3200 = 0
0 + 40x + x2 = 0 + 3200
40x + x2 = 0 + 3200

Combine like terms: 0 + 3200 = 3200
40x + x2 = 3200

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 = 3200 + 400

Reorder the terms:
400 + 40x + x2 = 3200 + 400

Combine like terms: 3200 + 400 = 3600
400 + 40x + x2 = 3600

Factor a perfect square on the left side:
(x + 20)(x + 20) = 3600

Calculate the square root of the right side: 60

Break this problem into two subproblems by setting 
(x + 20) equal to 60 and -60.

Subproblem 1

x + 20 = 60 Simplifying x + 20 = 60 Reorder the terms: 20 + x = 60 Solving 20 + x = 60 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 = 60 + -20 Combine like terms: 20 + -20 = 0 0 + x = 60 + -20 x = 60 + -20 Combine like terms: 60 + -20 = 40 x = 40 Simplifying x = 40

Subproblem 2

x + 20 = -60 Simplifying x + 20 = -60 Reorder the terms: 20 + x = -60 Solving 20 + x = -60 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 = -60 + -20 Combine like terms: 20 + -20 = 0 0 + x = -60 + -20 x = -60 + -20 Combine like terms: -60 + -20 = -80 x = -80 Simplifying x = -80

Solution

The solution to the problem is based on the solutions from the subproblems. x = {40, -80}

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