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

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


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

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

Combine like terms: -28i + -6i = -34i
(-21 + -34i + -8i2) = 0

Solving
-21 + -34i + -8i2 = 0

Solving for variable 'i'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(21 + 34i + 8i2) = 0

Factor a trinomial.
-1((7 + 2i)(3 + 4i)) = 0

Ignore the factor -1.

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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