(2+i)(4-5i)=

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Solution for (2+i)(4-5i)= equation:


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

Multiply (2 + i) * (4 + -5i)
(2(4 + -5i) + i(4 + -5i)) = 0
((4 * 2 + -5i * 2) + i(4 + -5i)) = 0
((8 + -10i) + i(4 + -5i)) = 0
(8 + -10i + (4 * i + -5i * i)) = 0
(8 + -10i + (4i + -5i2)) = 0

Combine like terms: -10i + 4i = -6i
(8 + -6i + -5i2) = 0

Solving
8 + -6i + -5i2 = 0

Solving for variable 'i'.

Factor a trinomial.
(4 + -5i)(2 + i) = 0

Subproblem 1

Set the factor '(4 + -5i)' equal to zero and attempt to solve: Simplifying 4 + -5i = 0 Solving 4 + -5i = 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 + -5i = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -5i = 0 + -4 -5i = 0 + -4 Combine like terms: 0 + -4 = -4 -5i = -4 Divide each side by '-5'. i = 0.8 Simplifying i = 0.8

Subproblem 2

Set the factor '(2 + i)' equal to zero and attempt to solve: Simplifying 2 + i = 0 Solving 2 + i = 0 Move all terms containing i to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + i = 0 + -2 Combine like terms: 2 + -2 = 0 0 + i = 0 + -2 i = 0 + -2 Combine like terms: 0 + -2 = -2 i = -2 Simplifying i = -2

Solution

i = {0.8, -2}

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