(3+4i)(7-2i)=

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Solution for (3+4i)(7-2i)= equation:


Simplifying
(3 + 4i)(7 + -2i) = 0

Multiply (3 + 4i) * (7 + -2i)
(3(7 + -2i) + 4i * (7 + -2i)) = 0
((7 * 3 + -2i * 3) + 4i * (7 + -2i)) = 0
((21 + -6i) + 4i * (7 + -2i)) = 0
(21 + -6i + (7 * 4i + -2i * 4i)) = 0
(21 + -6i + (28i + -8i2)) = 0

Combine like terms: -6i + 28i = 22i
(21 + 22i + -8i2) = 0

Solving
21 + 22i + -8i2 = 0

Solving for variable 'i'.

Factor a trinomial.
(7 + -2i)(3 + 4i) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(3 + 4i)' equal to zero and attempt to solve: Simplifying 3 + 4i = 0 Solving 3 + 4i = 0 Move all terms containing i to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4i = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 4i = 0 + -3 4i = 0 + -3 Combine like terms: 0 + -3 = -3 4i = -3 Divide each side by '4'. i = -0.75 Simplifying i = -0.75

Solution

i = {3.5, -0.75}

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