9(X)=7X^2-9

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Solution for 9(X)=7X^2-9 equation:


Simplifying
9(X) = 7X2 + -9

Reorder the terms:
9X = -9 + 7X2

Solving
9X = -9 + 7X2

Solving for variable 'X'.

Reorder the terms:
9 + 9X + -7X2 = -9 + 7X2 + 9 + -7X2

Reorder the terms:
9 + 9X + -7X2 = -9 + 9 + 7X2 + -7X2

Combine like terms: -9 + 9 = 0
9 + 9X + -7X2 = 0 + 7X2 + -7X2
9 + 9X + -7X2 = 7X2 + -7X2

Combine like terms: 7X2 + -7X2 = 0
9 + 9X + -7X2 = 0

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
-1.285714286 + -1.285714286X + X2 = 0

Move the constant term to the right:

Add '1.285714286' to each side of the equation.
-1.285714286 + -1.285714286X + 1.285714286 + X2 = 0 + 1.285714286

Reorder the terms:
-1.285714286 + 1.285714286 + -1.285714286X + X2 = 0 + 1.285714286

Combine like terms: -1.285714286 + 1.285714286 = 0.000000000
0.000000000 + -1.285714286X + X2 = 0 + 1.285714286
-1.285714286X + X2 = 0 + 1.285714286

Combine like terms: 0 + 1.285714286 = 1.285714286
-1.285714286X + X2 = 1.285714286

The X term is -1.285714286X.  Take half its coefficient (-0.642857143).
Square it (0.4132653063) and add it to both sides.

Add '0.4132653063' to each side of the equation.
-1.285714286X + 0.4132653063 + X2 = 1.285714286 + 0.4132653063

Reorder the terms:
0.4132653063 + -1.285714286X + X2 = 1.285714286 + 0.4132653063

Combine like terms: 1.285714286 + 0.4132653063 = 1.6989795923
0.4132653063 + -1.285714286X + X2 = 1.6989795923

Factor a perfect square on the left side:
(X + -0.642857143)(X + -0.642857143) = 1.6989795923

Calculate the square root of the right side: 1.303449114

Break this problem into two subproblems by setting 
(X + -0.642857143) equal to 1.303449114 and -1.303449114.

Subproblem 1

X + -0.642857143 = 1.303449114 Simplifying X + -0.642857143 = 1.303449114 Reorder the terms: -0.642857143 + X = 1.303449114 Solving -0.642857143 + X = 1.303449114 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.642857143' to each side of the equation. -0.642857143 + 0.642857143 + X = 1.303449114 + 0.642857143 Combine like terms: -0.642857143 + 0.642857143 = 0.000000000 0.000000000 + X = 1.303449114 + 0.642857143 X = 1.303449114 + 0.642857143 Combine like terms: 1.303449114 + 0.642857143 = 1.946306257 X = 1.946306257 Simplifying X = 1.946306257

Subproblem 2

X + -0.642857143 = -1.303449114 Simplifying X + -0.642857143 = -1.303449114 Reorder the terms: -0.642857143 + X = -1.303449114 Solving -0.642857143 + X = -1.303449114 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.642857143' to each side of the equation. -0.642857143 + 0.642857143 + X = -1.303449114 + 0.642857143 Combine like terms: -0.642857143 + 0.642857143 = 0.000000000 0.000000000 + X = -1.303449114 + 0.642857143 X = -1.303449114 + 0.642857143 Combine like terms: -1.303449114 + 0.642857143 = -0.660591971 X = -0.660591971 Simplifying X = -0.660591971

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.946306257, -0.660591971}

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