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

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


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

Multiply (4 + -5i) * (4 + i)
(4(4 + i) + -5i * (4 + i)) = 0
((4 * 4 + i * 4) + -5i * (4 + i)) = 0
((16 + 4i) + -5i * (4 + i)) = 0
(16 + 4i + (4 * -5i + i * -5i)) = 0
(16 + 4i + (-20i + -5i2)) = 0

Combine like terms: 4i + -20i = -16i
(16 + -16i + -5i2) = 0

Solving
16 + -16i + -5i2 = 0

Solving for variable 'i'.

Factor a trinomial.
(4 + -5i)(4 + 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 '(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 = {0.8, -4}

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