(5+i)(4+i)=

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Solution for (5+i)(4+i)= equation:


Simplifying
(5 + i)(4 + i) = 0

Multiply (5 + i) * (4 + i)
(5(4 + i) + i(4 + i)) = 0
((4 * 5 + i * 5) + i(4 + i)) = 0
((20 + 5i) + i(4 + i)) = 0
(20 + 5i + (4 * i + i * i)) = 0
(20 + 5i + (4i + i2)) = 0

Combine like terms: 5i + 4i = 9i
(20 + 9i + i2) = 0

Solving
20 + 9i + i2 = 0

Solving for variable 'i'.

Factor a trinomial.
(5 + i)(4 + i) = 0

Subproblem 1

Set the factor '(5 + i)' equal to zero and attempt to solve: Simplifying 5 + i = 0 Solving 5 + i = 0 Move all terms containing i to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + i = 0 + -5 Combine like terms: 5 + -5 = 0 0 + i = 0 + -5 i = 0 + -5 Combine like terms: 0 + -5 = -5 i = -5 Simplifying i = -5

Subproblem 2

Set the factor '(4 + i)' equal to zero and attempt to solve: Simplifying 4 + i = 0 Solving 4 + i = 0 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 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + i = 0 + -4 i = 0 + -4 Combine like terms: 0 + -4 = -4 i = -4 Simplifying i = -4

Solution

i = {-5, -4}

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