2400=105x-30-x^2

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Solution for 2400=105x-30-x^2 equation:


Simplifying
2400 = 105x + -30 + -1x2

Reorder the terms:
2400 = -30 + 105x + -1x2

Solving
2400 = -30 + 105x + -1x2

Solving for variable 'x'.

Combine like terms: 2400 + 30 = 2430
2430 + -105x + x2 = -30 + 105x + -1x2 + 30 + -105x + x2

Reorder the terms:
2430 + -105x + x2 = -30 + 30 + 105x + -105x + -1x2 + x2

Combine like terms: -30 + 30 = 0
2430 + -105x + x2 = 0 + 105x + -105x + -1x2 + x2
2430 + -105x + x2 = 105x + -105x + -1x2 + x2

Combine like terms: 105x + -105x = 0
2430 + -105x + x2 = 0 + -1x2 + x2
2430 + -105x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
2430 + -105x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2430' to each side of the equation.
2430 + -105x + -2430 + x2 = 0 + -2430

Reorder the terms:
2430 + -2430 + -105x + x2 = 0 + -2430

Combine like terms: 2430 + -2430 = 0
0 + -105x + x2 = 0 + -2430
-105x + x2 = 0 + -2430

Combine like terms: 0 + -2430 = -2430
-105x + x2 = -2430

The x term is -105x.  Take half its coefficient (-52.5).
Square it (2756.25) and add it to both sides.

Add '2756.25' to each side of the equation.
-105x + 2756.25 + x2 = -2430 + 2756.25

Reorder the terms:
2756.25 + -105x + x2 = -2430 + 2756.25

Combine like terms: -2430 + 2756.25 = 326.25
2756.25 + -105x + x2 = 326.25

Factor a perfect square on the left side:
(x + -52.5)(x + -52.5) = 326.25

Calculate the square root of the right side: 18.062391868

Break this problem into two subproblems by setting 
(x + -52.5) equal to 18.062391868 and -18.062391868.

Subproblem 1

x + -52.5 = 18.062391868 Simplifying x + -52.5 = 18.062391868 Reorder the terms: -52.5 + x = 18.062391868 Solving -52.5 + x = 18.062391868 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '52.5' to each side of the equation. -52.5 + 52.5 + x = 18.062391868 + 52.5 Combine like terms: -52.5 + 52.5 = 0.0 0.0 + x = 18.062391868 + 52.5 x = 18.062391868 + 52.5 Combine like terms: 18.062391868 + 52.5 = 70.562391868 x = 70.562391868 Simplifying x = 70.562391868

Subproblem 2

x + -52.5 = -18.062391868 Simplifying x + -52.5 = -18.062391868 Reorder the terms: -52.5 + x = -18.062391868 Solving -52.5 + x = -18.062391868 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '52.5' to each side of the equation. -52.5 + 52.5 + x = -18.062391868 + 52.5 Combine like terms: -52.5 + 52.5 = 0.0 0.0 + x = -18.062391868 + 52.5 x = -18.062391868 + 52.5 Combine like terms: -18.062391868 + 52.5 = 34.437608132 x = 34.437608132 Simplifying x = 34.437608132

Solution

The solution to the problem is based on the solutions from the subproblems. x = {70.562391868, 34.437608132}

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