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

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


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

Multiply (7 + 2i) * (4 + -7i)
(7(4 + -7i) + 2i * (4 + -7i)) = 0
((4 * 7 + -7i * 7) + 2i * (4 + -7i)) = 0
((28 + -49i) + 2i * (4 + -7i)) = 0
(28 + -49i + (4 * 2i + -7i * 2i)) = 0
(28 + -49i + (8i + -14i2)) = 0

Combine like terms: -49i + 8i = -41i
(28 + -41i + -14i2) = 0

Solving
28 + -41i + -14i2 = 0

Solving for variable 'i'.

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

Subproblem 1

Set the factor '(4 + -7i)' equal to zero and attempt to solve: Simplifying 4 + -7i = 0 Solving 4 + -7i = 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 + -7i = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -7i = 0 + -4 -7i = 0 + -4 Combine like terms: 0 + -4 = -4 -7i = -4 Divide each side by '-7'. i = 0.5714285714 Simplifying i = 0.5714285714

Subproblem 2

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

Solution

i = {0.5714285714, -3.5}

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