(4+5i)(3-7i)=

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Solution for (4+5i)(3-7i)= equation:


Simplifying
(4 + 5i)(3 + -7i) = 0

Multiply (4 + 5i) * (3 + -7i)
(4(3 + -7i) + 5i * (3 + -7i)) = 0
((3 * 4 + -7i * 4) + 5i * (3 + -7i)) = 0
((12 + -28i) + 5i * (3 + -7i)) = 0
(12 + -28i + (3 * 5i + -7i * 5i)) = 0
(12 + -28i + (15i + -35i2)) = 0

Combine like terms: -28i + 15i = -13i
(12 + -13i + -35i2) = 0

Solving
12 + -13i + -35i2 = 0

Solving for variable 'i'.

Factor a trinomial.
(3 + -7i)(4 + 5i) = 0

Subproblem 1

Set the factor '(3 + -7i)' equal to zero and attempt to solve: Simplifying 3 + -7i = 0 Solving 3 + -7i = 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 + -7i = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -7i = 0 + -3 -7i = 0 + -3 Combine like terms: 0 + -3 = -3 -7i = -3 Divide each side by '-7'. i = 0.4285714286 Simplifying i = 0.4285714286

Subproblem 2

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

Solution

i = {0.4285714286, -0.8}

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