X=1.02X*X-100

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Solution for X=1.02X*X-100 equation:


Simplifying
X = 1.02X * X + -100

Multiply X * X
X = 1.02X2 + -100

Reorder the terms:
X = -100 + 1.02X2

Solving
X = -100 + 1.02X2

Solving for variable 'X'.

Reorder the terms:
100 + X + -1.02X2 = -100 + 1.02X2 + 100 + -1.02X2

Reorder the terms:
100 + X + -1.02X2 = -100 + 100 + 1.02X2 + -1.02X2

Combine like terms: -100 + 100 = 0
100 + X + -1.02X2 = 0 + 1.02X2 + -1.02X2
100 + X + -1.02X2 = 1.02X2 + -1.02X2

Combine like terms: 1.02X2 + -1.02X2 = 0.00
100 + X + -1.02X2 = 0.00

Begin completing the square.  Divide all terms by
-1.02 the coefficient of the squared term: 

Divide each side by '-1.02'.
-98.03921569 + -0.9803921569X + X2 = 0

Move the constant term to the right:

Add '98.03921569' to each side of the equation.
-98.03921569 + -0.9803921569X + 98.03921569 + X2 = 0 + 98.03921569

Reorder the terms:
-98.03921569 + 98.03921569 + -0.9803921569X + X2 = 0 + 98.03921569

Combine like terms: -98.03921569 + 98.03921569 = 0.00000000
0.00000000 + -0.9803921569X + X2 = 0 + 98.03921569
-0.9803921569X + X2 = 0 + 98.03921569

Combine like terms: 0 + 98.03921569 = 98.03921569
-0.9803921569X + X2 = 98.03921569

The X term is X.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.9803921569X + 0.25 + X2 = 98.03921569 + 0.25

Reorder the terms:
0.25 + -0.9803921569X + X2 = 98.03921569 + 0.25

Combine like terms: 98.03921569 + 0.25 = 98.28921569
0.25 + -0.9803921569X + X2 = 98.28921569

Factor a perfect square on the left side:
(X + 0.5)(X + 0.5) = 98.28921569

Calculate the square root of the right side: 9.914091773

Break this problem into two subproblems by setting 
(X + 0.5) equal to 9.914091773 and -9.914091773.

Subproblem 1

X + 0.5 = 9.914091773 Simplifying X + 0.5 = 9.914091773 Reorder the terms: 0.5 + X = 9.914091773 Solving 0.5 + X = 9.914091773 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + X = 9.914091773 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = 9.914091773 + -0.5 X = 9.914091773 + -0.5 Combine like terms: 9.914091773 + -0.5 = 9.414091773 X = 9.414091773 Simplifying X = 9.414091773

Subproblem 2

X + 0.5 = -9.914091773 Simplifying X + 0.5 = -9.914091773 Reorder the terms: 0.5 + X = -9.914091773 Solving 0.5 + X = -9.914091773 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + X = -9.914091773 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = -9.914091773 + -0.5 X = -9.914091773 + -0.5 Combine like terms: -9.914091773 + -0.5 = -10.414091773 X = -10.414091773 Simplifying X = -10.414091773

Solution

The solution to the problem is based on the solutions from the subproblems. X = {9.414091773, -10.414091773}

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