(2+7i)i-(3+5i)(5+i)=

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Solution for (2+7i)i-(3+5i)(5+i)= equation:


Simplifying
(2 + 7i) * i + -1(3 + 5i)(5 + i) = 0

Reorder the terms for easier multiplication:
i(2 + 7i) + -1(3 + 5i)(5 + i) = 0
(2 * i + 7i * i) + -1(3 + 5i)(5 + i) = 0
(2i + 7i2) + -1(3 + 5i)(5 + i) = 0

Multiply (3 + 5i) * (5 + i)
2i + 7i2 + -1(3(5 + i) + 5i * (5 + i)) = 0
2i + 7i2 + -1((5 * 3 + i * 3) + 5i * (5 + i)) = 0
2i + 7i2 + -1((15 + 3i) + 5i * (5 + i)) = 0
2i + 7i2 + -1(15 + 3i + (5 * 5i + i * 5i)) = 0
2i + 7i2 + -1(15 + 3i + (25i + 5i2)) = 0

Combine like terms: 3i + 25i = 28i
2i + 7i2 + -1(15 + 28i + 5i2) = 0
2i + 7i2 + (15 * -1 + 28i * -1 + 5i2 * -1) = 0
2i + 7i2 + (-15 + -28i + -5i2) = 0

Reorder the terms:
-15 + 2i + -28i + 7i2 + -5i2 = 0

Combine like terms: 2i + -28i = -26i
-15 + -26i + 7i2 + -5i2 = 0

Combine like terms: 7i2 + -5i2 = 2i2
-15 + -26i + 2i2 = 0

Solving
-15 + -26i + 2i2 = 0

Solving for variable 'i'.

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

Divide each side by '2'.
-7.5 + -13i + i2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + -13i + 7.5 + i2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + -13i + i2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + -13i + i2 = 0 + 7.5
-13i + i2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
-13i + i2 = 7.5

The i term is -13i.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13i + 42.25 + i2 = 7.5 + 42.25

Reorder the terms:
42.25 + -13i + i2 = 7.5 + 42.25

Combine like terms: 7.5 + 42.25 = 49.75
42.25 + -13i + i2 = 49.75

Factor a perfect square on the left side:
(i + -6.5)(i + -6.5) = 49.75

Calculate the square root of the right side: 7.05336799

Break this problem into two subproblems by setting 
(i + -6.5) equal to 7.05336799 and -7.05336799.

Subproblem 1

i + -6.5 = 7.05336799 Simplifying i + -6.5 = 7.05336799 Reorder the terms: -6.5 + i = 7.05336799 Solving -6.5 + i = 7.05336799 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + i = 7.05336799 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + i = 7.05336799 + 6.5 i = 7.05336799 + 6.5 Combine like terms: 7.05336799 + 6.5 = 13.55336799 i = 13.55336799 Simplifying i = 13.55336799

Subproblem 2

i + -6.5 = -7.05336799 Simplifying i + -6.5 = -7.05336799 Reorder the terms: -6.5 + i = -7.05336799 Solving -6.5 + i = -7.05336799 Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + i = -7.05336799 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + i = -7.05336799 + 6.5 i = -7.05336799 + 6.5 Combine like terms: -7.05336799 + 6.5 = -0.55336799 i = -0.55336799 Simplifying i = -0.55336799

Solution

The solution to the problem is based on the solutions from the subproblems. i = {13.55336799, -0.55336799}

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