2.7=10I-7I^2

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Solution for 2.7=10I-7I^2 equation:


Simplifying
2.7 = 10I + -7I2

Solving
2.7 = 10I + -7I2

Solving for variable 'I'.

Reorder the terms:
2.7 + -10I + 7I2 = 10I + -10I + -7I2 + 7I2

Combine like terms: 10I + -10I = 0
2.7 + -10I + 7I2 = 0 + -7I2 + 7I2
2.7 + -10I + 7I2 = -7I2 + 7I2

Combine like terms: -7I2 + 7I2 = 0
2.7 + -10I + 7I2 = 0

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

Divide each side by '7'.
0.3857142857 + -1.428571429I + I2 = 0

Move the constant term to the right:

Add '-0.3857142857' to each side of the equation.
0.3857142857 + -1.428571429I + -0.3857142857 + I2 = 0 + -0.3857142857

Reorder the terms:
0.3857142857 + -0.3857142857 + -1.428571429I + I2 = 0 + -0.3857142857

Combine like terms: 0.3857142857 + -0.3857142857 = 0.0000000000
0.0000000000 + -1.428571429I + I2 = 0 + -0.3857142857
-1.428571429I + I2 = 0 + -0.3857142857

Combine like terms: 0 + -0.3857142857 = -0.3857142857
-1.428571429I + I2 = -0.3857142857

The I term is -1.428571429I.  Take half its coefficient (-0.7142857145).
Square it (0.5102040819) and add it to both sides.

Add '0.5102040819' to each side of the equation.
-1.428571429I + 0.5102040819 + I2 = -0.3857142857 + 0.5102040819

Reorder the terms:
0.5102040819 + -1.428571429I + I2 = -0.3857142857 + 0.5102040819

Combine like terms: -0.3857142857 + 0.5102040819 = 0.1244897962
0.5102040819 + -1.428571429I + I2 = 0.1244897962

Factor a perfect square on the left side:
(I + -0.7142857145)(I + -0.7142857145) = 0.1244897962

Calculate the square root of the right side: 0.352831116

Break this problem into two subproblems by setting 
(I + -0.7142857145) equal to 0.352831116 and -0.352831116.

Subproblem 1

I + -0.7142857145 = 0.352831116 Simplifying I + -0.7142857145 = 0.352831116 Reorder the terms: -0.7142857145 + I = 0.352831116 Solving -0.7142857145 + I = 0.352831116 Solving for variable 'I'. Move all terms containing I to the left, all other terms to the right. Add '0.7142857145' to each side of the equation. -0.7142857145 + 0.7142857145 + I = 0.352831116 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + I = 0.352831116 + 0.7142857145 I = 0.352831116 + 0.7142857145 Combine like terms: 0.352831116 + 0.7142857145 = 1.0671168305 I = 1.0671168305 Simplifying I = 1.0671168305

Subproblem 2

I + -0.7142857145 = -0.352831116 Simplifying I + -0.7142857145 = -0.352831116 Reorder the terms: -0.7142857145 + I = -0.352831116 Solving -0.7142857145 + I = -0.352831116 Solving for variable 'I'. Move all terms containing I to the left, all other terms to the right. Add '0.7142857145' to each side of the equation. -0.7142857145 + 0.7142857145 + I = -0.352831116 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + I = -0.352831116 + 0.7142857145 I = -0.352831116 + 0.7142857145 Combine like terms: -0.352831116 + 0.7142857145 = 0.3614545985 I = 0.3614545985 Simplifying I = 0.3614545985

Solution

The solution to the problem is based on the solutions from the subproblems. I = {1.0671168305, 0.3614545985}

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