(5-4i)(7+2i)=

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Solution for (5-4i)(7+2i)= equation:


Simplifying
(5 + -4i)(7 + 2i) = 0

Multiply (5 + -4i) * (7 + 2i)
(5(7 + 2i) + -4i * (7 + 2i)) = 0
((7 * 5 + 2i * 5) + -4i * (7 + 2i)) = 0
((35 + 10i) + -4i * (7 + 2i)) = 0
(35 + 10i + (7 * -4i + 2i * -4i)) = 0
(35 + 10i + (-28i + -8i2)) = 0

Combine like terms: 10i + -28i = -18i
(35 + -18i + -8i2) = 0

Solving
35 + -18i + -8i2 = 0

Solving for variable 'i'.

Factor a trinomial.
(5 + -4i)(7 + 2i) = 0

Subproblem 1

Set the factor '(5 + -4i)' equal to zero and attempt to solve: Simplifying 5 + -4i = 0 Solving 5 + -4i = 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 + -4i = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4i = 0 + -5 -4i = 0 + -5 Combine like terms: 0 + -5 = -5 -4i = -5 Divide each side by '-4'. i = 1.25 Simplifying i = 1.25

Subproblem 2

Set the factor '(7 + 2i)' equal to zero and attempt to solve: Simplifying 7 + 2i = 0 Solving 7 + 2i = 0 Move all terms containing i to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2i = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 2i = 0 + -7 2i = 0 + -7 Combine like terms: 0 + -7 = -7 2i = -7 Divide each side by '2'. i = -3.5 Simplifying i = -3.5

Solution

i = {1.25, -3.5}

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