1700-40x-x^2=0

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Solution for 1700-40x-x^2=0 equation:


Simplifying
1700 + -40x + -1x2 = 0

Solving
1700 + -40x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1700 + 40x + x2 = 0

Move the constant term to the right:

Add '1700' to each side of the equation.
-1700 + 40x + 1700 + x2 = 0 + 1700

Reorder the terms:
-1700 + 1700 + 40x + x2 = 0 + 1700

Combine like terms: -1700 + 1700 = 0
0 + 40x + x2 = 0 + 1700
40x + x2 = 0 + 1700

Combine like terms: 0 + 1700 = 1700
40x + x2 = 1700

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 = 1700 + 400

Reorder the terms:
400 + 40x + x2 = 1700 + 400

Combine like terms: 1700 + 400 = 2100
400 + 40x + x2 = 2100

Factor a perfect square on the left side:
(x + 20)(x + 20) = 2100

Calculate the square root of the right side: 45.82575695

Break this problem into two subproblems by setting 
(x + 20) equal to 45.82575695 and -45.82575695.

Subproblem 1

x + 20 = 45.82575695 Simplifying x + 20 = 45.82575695 Reorder the terms: 20 + x = 45.82575695 Solving 20 + x = 45.82575695 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 = 45.82575695 + -20 Combine like terms: 20 + -20 = 0 0 + x = 45.82575695 + -20 x = 45.82575695 + -20 Combine like terms: 45.82575695 + -20 = 25.82575695 x = 25.82575695 Simplifying x = 25.82575695

Subproblem 2

x + 20 = -45.82575695 Simplifying x + 20 = -45.82575695 Reorder the terms: 20 + x = -45.82575695 Solving 20 + x = -45.82575695 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 = -45.82575695 + -20 Combine like terms: 20 + -20 = 0 0 + x = -45.82575695 + -20 x = -45.82575695 + -20 Combine like terms: -45.82575695 + -20 = -65.82575695 x = -65.82575695 Simplifying x = -65.82575695

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.82575695, -65.82575695}

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