x^2-30x-25=40x+100

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Solution for x^2-30x-25=40x+100 equation:


Simplifying
x2 + -30x + -25 = 40x + 100

Reorder the terms:
-25 + -30x + x2 = 40x + 100

Reorder the terms:
-25 + -30x + x2 = 100 + 40x

Solving
-25 + -30x + x2 = 100 + 40x

Solving for variable 'x'.

Reorder the terms:
-25 + -100 + -30x + -40x + x2 = 100 + 40x + -100 + -40x

Combine like terms: -25 + -100 = -125
-125 + -30x + -40x + x2 = 100 + 40x + -100 + -40x

Combine like terms: -30x + -40x = -70x
-125 + -70x + x2 = 100 + 40x + -100 + -40x

Reorder the terms:
-125 + -70x + x2 = 100 + -100 + 40x + -40x

Combine like terms: 100 + -100 = 0
-125 + -70x + x2 = 0 + 40x + -40x
-125 + -70x + x2 = 40x + -40x

Combine like terms: 40x + -40x = 0
-125 + -70x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '125' to each side of the equation.
-125 + -70x + 125 + x2 = 0 + 125

Reorder the terms:
-125 + 125 + -70x + x2 = 0 + 125

Combine like terms: -125 + 125 = 0
0 + -70x + x2 = 0 + 125
-70x + x2 = 0 + 125

Combine like terms: 0 + 125 = 125
-70x + x2 = 125

The x term is -70x.  Take half its coefficient (-35).
Square it (1225) and add it to both sides.

Add '1225' to each side of the equation.
-70x + 1225 + x2 = 125 + 1225

Reorder the terms:
1225 + -70x + x2 = 125 + 1225

Combine like terms: 125 + 1225 = 1350
1225 + -70x + x2 = 1350

Factor a perfect square on the left side:
(x + -35)(x + -35) = 1350

Calculate the square root of the right side: 36.742346142

Break this problem into two subproblems by setting 
(x + -35) equal to 36.742346142 and -36.742346142.

Subproblem 1

x + -35 = 36.742346142 Simplifying x + -35 = 36.742346142 Reorder the terms: -35 + x = 36.742346142 Solving -35 + x = 36.742346142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + x = 36.742346142 + 35 Combine like terms: -35 + 35 = 0 0 + x = 36.742346142 + 35 x = 36.742346142 + 35 Combine like terms: 36.742346142 + 35 = 71.742346142 x = 71.742346142 Simplifying x = 71.742346142

Subproblem 2

x + -35 = -36.742346142 Simplifying x + -35 = -36.742346142 Reorder the terms: -35 + x = -36.742346142 Solving -35 + x = -36.742346142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + x = -36.742346142 + 35 Combine like terms: -35 + 35 = 0 0 + x = -36.742346142 + 35 x = -36.742346142 + 35 Combine like terms: -36.742346142 + 35 = -1.742346142 x = -1.742346142 Simplifying x = -1.742346142

Solution

The solution to the problem is based on the solutions from the subproblems. x = {71.742346142, -1.742346142}

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