800-7x-.01x^2=0

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Solution for 800-7x-.01x^2=0 equation:


Simplifying
800 + -7x + -0.01x2 = 0

Solving
800 + -7x + -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'.
-80000 + 700x + x2 = 0

Move the constant term to the right:

Add '80000' to each side of the equation.
-80000 + 700x + 80000 + x2 = 0 + 80000

Reorder the terms:
-80000 + 80000 + 700x + x2 = 0 + 80000

Combine like terms: -80000 + 80000 = 0
0 + 700x + x2 = 0 + 80000
700x + x2 = 0 + 80000

Combine like terms: 0 + 80000 = 80000
700x + x2 = 80000

The x term is 700x.  Take half its coefficient (350).
Square it (122500) and add it to both sides.

Add '122500' to each side of the equation.
700x + 122500 + x2 = 80000 + 122500

Reorder the terms:
122500 + 700x + x2 = 80000 + 122500

Combine like terms: 80000 + 122500 = 202500
122500 + 700x + x2 = 202500

Factor a perfect square on the left side:
(x + 350)(x + 350) = 202500

Calculate the square root of the right side: 450

Break this problem into two subproblems by setting 
(x + 350) equal to 450 and -450.

Subproblem 1

x + 350 = 450 Simplifying x + 350 = 450 Reorder the terms: 350 + x = 450 Solving 350 + x = 450 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-350' to each side of the equation. 350 + -350 + x = 450 + -350 Combine like terms: 350 + -350 = 0 0 + x = 450 + -350 x = 450 + -350 Combine like terms: 450 + -350 = 100 x = 100 Simplifying x = 100

Subproblem 2

x + 350 = -450 Simplifying x + 350 = -450 Reorder the terms: 350 + x = -450 Solving 350 + x = -450 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-350' to each side of the equation. 350 + -350 + x = -450 + -350 Combine like terms: 350 + -350 = 0 0 + x = -450 + -350 x = -450 + -350 Combine like terms: -450 + -350 = -800 x = -800 Simplifying x = -800

Solution

The solution to the problem is based on the solutions from the subproblems. x = {100, -800}

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