.7x^2-28x+12000=11790

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Solution for .7x^2-28x+12000=11790 equation:


Simplifying
0.7x2 + -28x + 12000 = 11790

Reorder the terms:
12000 + -28x + 0.7x2 = 11790

Solving
12000 + -28x + 0.7x2 = 11790

Solving for variable 'x'.

Reorder the terms:
12000 + -11790 + -28x + 0.7x2 = 11790 + -11790

Combine like terms: 12000 + -11790 = 210
210 + -28x + 0.7x2 = 11790 + -11790

Combine like terms: 11790 + -11790 = 0
210 + -28x + 0.7x2 = 0

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

Divide each side by '0.7'.
300 + -40x + x2 = 0

Move the constant term to the right:

Add '-300' to each side of the equation.
300 + -40x + -300 + x2 = 0 + -300

Reorder the terms:
300 + -300 + -40x + x2 = 0 + -300

Combine like terms: 300 + -300 = 0
0 + -40x + x2 = 0 + -300
-40x + x2 = 0 + -300

Combine like terms: 0 + -300 = -300
-40x + x2 = -300

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 = -300 + 400

Reorder the terms:
400 + -40x + x2 = -300 + 400

Combine like terms: -300 + 400 = 100
400 + -40x + x2 = 100

Factor a perfect square on the left side:
(x + -20)(x + -20) = 100

Calculate the square root of the right side: 10

Break this problem into two subproblems by setting 
(x + -20) equal to 10 and -10.

Subproblem 1

x + -20 = 10 Simplifying x + -20 = 10 Reorder the terms: -20 + x = 10 Solving -20 + x = 10 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 = 10 + 20 Combine like terms: -20 + 20 = 0 0 + x = 10 + 20 x = 10 + 20 Combine like terms: 10 + 20 = 30 x = 30 Simplifying x = 30

Subproblem 2

x + -20 = -10 Simplifying x + -20 = -10 Reorder the terms: -20 + x = -10 Solving -20 + x = -10 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 = -10 + 20 Combine like terms: -20 + 20 = 0 0 + x = -10 + 20 x = -10 + 20 Combine like terms: -10 + 20 = 10 x = 10 Simplifying x = 10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30, 10}

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