=70+2x-.02x^2

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Solution for =70+2x-.02x^2 equation:


Simplifying
0 = 70 + 2x + -0.02x2

Solving
0 = 70 + 2x + -0.02x2

Solving for variable 'x'.

Combine like terms: 0 + -70 = -70
-70 + -2x + 0.02x2 = 70 + 2x + -0.02x2 + -70 + -2x + 0.02x2

Reorder the terms:
-70 + -2x + 0.02x2 = 70 + -70 + 2x + -2x + -0.02x2 + 0.02x2

Combine like terms: 70 + -70 = 0
-70 + -2x + 0.02x2 = 0 + 2x + -2x + -0.02x2 + 0.02x2
-70 + -2x + 0.02x2 = 2x + -2x + -0.02x2 + 0.02x2

Combine like terms: 2x + -2x = 0
-70 + -2x + 0.02x2 = 0 + -0.02x2 + 0.02x2
-70 + -2x + 0.02x2 = -0.02x2 + 0.02x2

Combine like terms: -0.02x2 + 0.02x2 = 0.00
-70 + -2x + 0.02x2 = 0.00

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

Divide each side by '0.02'.
-3500 + -100x + x2 = 0

Move the constant term to the right:

Add '3500' to each side of the equation.
-3500 + -100x + 3500 + x2 = 0 + 3500

Reorder the terms:
-3500 + 3500 + -100x + x2 = 0 + 3500

Combine like terms: -3500 + 3500 = 0
0 + -100x + x2 = 0 + 3500
-100x + x2 = 0 + 3500

Combine like terms: 0 + 3500 = 3500
-100x + x2 = 3500

The x term is -100x.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100x + 2500 + x2 = 3500 + 2500

Reorder the terms:
2500 + -100x + x2 = 3500 + 2500

Combine like terms: 3500 + 2500 = 6000
2500 + -100x + x2 = 6000

Factor a perfect square on the left side:
(x + -50)(x + -50) = 6000

Calculate the square root of the right side: 77.459666924

Break this problem into two subproblems by setting 
(x + -50) equal to 77.459666924 and -77.459666924.

Subproblem 1

x + -50 = 77.459666924 Simplifying x + -50 = 77.459666924 Reorder the terms: -50 + x = 77.459666924 Solving -50 + x = 77.459666924 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = 77.459666924 + 50 Combine like terms: -50 + 50 = 0 0 + x = 77.459666924 + 50 x = 77.459666924 + 50 Combine like terms: 77.459666924 + 50 = 127.459666924 x = 127.459666924 Simplifying x = 127.459666924

Subproblem 2

x + -50 = -77.459666924 Simplifying x + -50 = -77.459666924 Reorder the terms: -50 + x = -77.459666924 Solving -50 + x = -77.459666924 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = -77.459666924 + 50 Combine like terms: -50 + 50 = 0 0 + x = -77.459666924 + 50 x = -77.459666924 + 50 Combine like terms: -77.459666924 + 50 = -27.459666924 x = -27.459666924 Simplifying x = -27.459666924

Solution

The solution to the problem is based on the solutions from the subproblems. x = {127.459666924, -27.459666924}

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