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

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Solution for (7-4i)(5-2i)=0 equation:


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

Multiply (7 + -4i) * (5 + -2i)
(7(5 + -2i) + -4i * (5 + -2i)) = 0
((5 * 7 + -2i * 7) + -4i * (5 + -2i)) = 0
((35 + -14i) + -4i * (5 + -2i)) = 0
(35 + -14i + (5 * -4i + -2i * -4i)) = 0
(35 + -14i + (-20i + 8i2)) = 0

Combine like terms: -14i + -20i = -34i
(35 + -34i + 8i2) = 0

Solving
35 + -34i + 8i2 = 0

Solving for variable 'i'.

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

Subproblem 1

Set the factor '(7 + -4i)' equal to zero and attempt to solve: Simplifying 7 + -4i = 0 Solving 7 + -4i = 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 + -4i = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -4i = 0 + -7 -4i = 0 + -7 Combine like terms: 0 + -7 = -7 -4i = -7 Divide each side by '-4'. i = 1.75 Simplifying i = 1.75

Subproblem 2

Set the factor '(5 + -2i)' equal to zero and attempt to solve: Simplifying 5 + -2i = 0 Solving 5 + -2i = 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 + -2i = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2i = 0 + -5 -2i = 0 + -5 Combine like terms: 0 + -5 = -5 -2i = -5 Divide each side by '-2'. i = 2.5 Simplifying i = 2.5

Solution

i = {1.75, 2.5}

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