12+10x+0.5x^2=900

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Solution for 12+10x+0.5x^2=900 equation:


Simplifying
12 + 10x + 0.5x2 = 900

Solving
12 + 10x + 0.5x2 = 900

Solving for variable 'x'.

Reorder the terms:
12 + -900 + 10x + 0.5x2 = 900 + -900

Combine like terms: 12 + -900 = -888
-888 + 10x + 0.5x2 = 900 + -900

Combine like terms: 900 + -900 = 0
-888 + 10x + 0.5x2 = 0

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

Divide each side by '0.5'.
-1776 + 20x + x2 = 0

Move the constant term to the right:

Add '1776' to each side of the equation.
-1776 + 20x + 1776 + x2 = 0 + 1776

Reorder the terms:
-1776 + 1776 + 20x + x2 = 0 + 1776

Combine like terms: -1776 + 1776 = 0
0 + 20x + x2 = 0 + 1776
20x + x2 = 0 + 1776

Combine like terms: 0 + 1776 = 1776
20x + x2 = 1776

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 1776 + 100

Reorder the terms:
100 + 20x + x2 = 1776 + 100

Combine like terms: 1776 + 100 = 1876
100 + 20x + x2 = 1876

Factor a perfect square on the left side:
(x + 10)(x + 10) = 1876

Calculate the square root of the right side: 43.312815655

Break this problem into two subproblems by setting 
(x + 10) equal to 43.312815655 and -43.312815655.

Subproblem 1

x + 10 = 43.312815655 Simplifying x + 10 = 43.312815655 Reorder the terms: 10 + x = 43.312815655 Solving 10 + x = 43.312815655 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 43.312815655 + -10 Combine like terms: 10 + -10 = 0 0 + x = 43.312815655 + -10 x = 43.312815655 + -10 Combine like terms: 43.312815655 + -10 = 33.312815655 x = 33.312815655 Simplifying x = 33.312815655

Subproblem 2

x + 10 = -43.312815655 Simplifying x + 10 = -43.312815655 Reorder the terms: 10 + x = -43.312815655 Solving 10 + x = -43.312815655 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -43.312815655 + -10 Combine like terms: 10 + -10 = 0 0 + x = -43.312815655 + -10 x = -43.312815655 + -10 Combine like terms: -43.312815655 + -10 = -53.312815655 x = -53.312815655 Simplifying x = -53.312815655

Solution

The solution to the problem is based on the solutions from the subproblems. x = {33.312815655, -53.312815655}

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