-0.01x^2+8x-700=0

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Solution for -0.01x^2+8x-700=0 equation:


Simplifying
-0.01x2 + 8x + -700 = 0

Reorder the terms:
-700 + 8x + -0.01x2 = 0

Solving
-700 + 8x + -0.01x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.01 the coefficient of the squared term: 

Divide each side by '-0.01'.
70000 + -800x + x2 = 0

Move the constant term to the right:

Add '-70000' to each side of the equation.
70000 + -800x + -70000 + x2 = 0 + -70000

Reorder the terms:
70000 + -70000 + -800x + x2 = 0 + -70000

Combine like terms: 70000 + -70000 = 0
0 + -800x + x2 = 0 + -70000
-800x + x2 = 0 + -70000

Combine like terms: 0 + -70000 = -70000
-800x + x2 = -70000

The x term is -800x.  Take half its coefficient (-400).
Square it (160000) and add it to both sides.

Add '160000' to each side of the equation.
-800x + 160000 + x2 = -70000 + 160000

Reorder the terms:
160000 + -800x + x2 = -70000 + 160000

Combine like terms: -70000 + 160000 = 90000
160000 + -800x + x2 = 90000

Factor a perfect square on the left side:
(x + -400)(x + -400) = 90000

Calculate the square root of the right side: 300

Break this problem into two subproblems by setting 
(x + -400) equal to 300 and -300.

Subproblem 1

x + -400 = 300 Simplifying x + -400 = 300 Reorder the terms: -400 + x = 300 Solving -400 + x = 300 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '400' to each side of the equation. -400 + 400 + x = 300 + 400 Combine like terms: -400 + 400 = 0 0 + x = 300 + 400 x = 300 + 400 Combine like terms: 300 + 400 = 700 x = 700 Simplifying x = 700

Subproblem 2

x + -400 = -300 Simplifying x + -400 = -300 Reorder the terms: -400 + x = -300 Solving -400 + x = -300 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '400' to each side of the equation. -400 + 400 + x = -300 + 400 Combine like terms: -400 + 400 = 0 0 + x = -300 + 400 x = -300 + 400 Combine like terms: -300 + 400 = 100 x = 100 Simplifying x = 100

Solution

The solution to the problem is based on the solutions from the subproblems. x = {700, 100}

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