(2+7i)(4-9i)=

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Solution for (2+7i)(4-9i)= equation:


Simplifying
(2 + 7i)(4 + -9i) = 0

Multiply (2 + 7i) * (4 + -9i)
(2(4 + -9i) + 7i * (4 + -9i)) = 0
((4 * 2 + -9i * 2) + 7i * (4 + -9i)) = 0
((8 + -18i) + 7i * (4 + -9i)) = 0
(8 + -18i + (4 * 7i + -9i * 7i)) = 0
(8 + -18i + (28i + -63i2)) = 0

Combine like terms: -18i + 28i = 10i
(8 + 10i + -63i2) = 0

Solving
8 + 10i + -63i2 = 0

Solving for variable 'i'.

Factor a trinomial.
(4 + -9i)(2 + 7i) = 0

Subproblem 1

Set the factor '(4 + -9i)' equal to zero and attempt to solve: Simplifying 4 + -9i = 0 Solving 4 + -9i = 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 + -9i = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -9i = 0 + -4 -9i = 0 + -4 Combine like terms: 0 + -4 = -4 -9i = -4 Divide each side by '-9'. i = 0.4444444444 Simplifying i = 0.4444444444

Subproblem 2

Set the factor '(2 + 7i)' equal to zero and attempt to solve: Simplifying 2 + 7i = 0 Solving 2 + 7i = 0 Move all terms containing i to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 7i = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 7i = 0 + -2 7i = 0 + -2 Combine like terms: 0 + -2 = -2 7i = -2 Divide each side by '7'. i = -0.2857142857 Simplifying i = -0.2857142857

Solution

i = {0.4444444444, -0.2857142857}

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