(X-5)*(X+9)=175

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Solution for (X-5)*(X+9)=175 equation:


Simplifying
(X + -5)(X + 9) = 175

Reorder the terms:
(-5 + X)(X + 9) = 175

Reorder the terms:
(-5 + X)(9 + X) = 175

Multiply (-5 + X) * (9 + X)
(-5(9 + X) + X(9 + X)) = 175
((9 * -5 + X * -5) + X(9 + X)) = 175
((-45 + -5X) + X(9 + X)) = 175
(-45 + -5X + (9 * X + X * X)) = 175
(-45 + -5X + (9X + X2)) = 175

Combine like terms: -5X + 9X = 4X
(-45 + 4X + X2) = 175

Solving
-45 + 4X + X2 = 175

Solving for variable 'X'.

Reorder the terms:
-45 + -175 + 4X + X2 = 175 + -175

Combine like terms: -45 + -175 = -220
-220 + 4X + X2 = 175 + -175

Combine like terms: 175 + -175 = 0
-220 + 4X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '220' to each side of the equation.
-220 + 4X + 220 + X2 = 0 + 220

Reorder the terms:
-220 + 220 + 4X + X2 = 0 + 220

Combine like terms: -220 + 220 = 0
0 + 4X + X2 = 0 + 220
4X + X2 = 0 + 220

Combine like terms: 0 + 220 = 220
4X + X2 = 220

The X term is 4X.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4X + 4 + X2 = 220 + 4

Reorder the terms:
4 + 4X + X2 = 220 + 4

Combine like terms: 220 + 4 = 224
4 + 4X + X2 = 224

Factor a perfect square on the left side:
(X + 2)(X + 2) = 224

Calculate the square root of the right side: 14.966629547

Break this problem into two subproblems by setting 
(X + 2) equal to 14.966629547 and -14.966629547.

Subproblem 1

X + 2 = 14.966629547 Simplifying X + 2 = 14.966629547 Reorder the terms: 2 + X = 14.966629547 Solving 2 + X = 14.966629547 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + X = 14.966629547 + -2 Combine like terms: 2 + -2 = 0 0 + X = 14.966629547 + -2 X = 14.966629547 + -2 Combine like terms: 14.966629547 + -2 = 12.966629547 X = 12.966629547 Simplifying X = 12.966629547

Subproblem 2

X + 2 = -14.966629547 Simplifying X + 2 = -14.966629547 Reorder the terms: 2 + X = -14.966629547 Solving 2 + X = -14.966629547 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + X = -14.966629547 + -2 Combine like terms: 2 + -2 = 0 0 + X = -14.966629547 + -2 X = -14.966629547 + -2 Combine like terms: -14.966629547 + -2 = -16.966629547 X = -16.966629547 Simplifying X = -16.966629547

Solution

The solution to the problem is based on the solutions from the subproblems. X = {12.966629547, -16.966629547}

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