.5i^2+4i-10=0

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Solution for .5i^2+4i-10=0 equation:


Simplifying
0.5i2 + 4i + -10 = 0

Reorder the terms:
-10 + 4i + 0.5i2 = 0

Solving
-10 + 4i + 0.5i2 = 0

Solving for variable 'i'.

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

Divide each side by '0.5'.
-20 + 8i + i2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 8i + 20 + i2 = 0 + 20

Reorder the terms:
-20 + 20 + 8i + i2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 8i + i2 = 0 + 20
8i + i2 = 0 + 20

Combine like terms: 0 + 20 = 20
8i + i2 = 20

The i term is 8i.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8i + 16 + i2 = 20 + 16

Reorder the terms:
16 + 8i + i2 = 20 + 16

Combine like terms: 20 + 16 = 36
16 + 8i + i2 = 36

Factor a perfect square on the left side:
(i + 4)(i + 4) = 36

Calculate the square root of the right side: 6

Break this problem into two subproblems by setting 
(i + 4) equal to 6 and -6.

Subproblem 1

i + 4 = 6 Simplifying i + 4 = 6 Reorder the terms: 4 + i = 6 Solving 4 + i = 6 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + i = 6 + -4 Combine like terms: 4 + -4 = 0 0 + i = 6 + -4 i = 6 + -4 Combine like terms: 6 + -4 = 2 i = 2 Simplifying i = 2

Subproblem 2

i + 4 = -6 Simplifying i + 4 = -6 Reorder the terms: 4 + i = -6 Solving 4 + i = -6 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + i = -6 + -4 Combine like terms: 4 + -4 = 0 0 + i = -6 + -4 i = -6 + -4 Combine like terms: -6 + -4 = -10 i = -10 Simplifying i = -10

Solution

The solution to the problem is based on the solutions from the subproblems. i = {2, -10}

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