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Asked Dec 14, 2019
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practice question 13

13. Multiply and simplify: (6+ i)(7 + 9i).
Write the answer in the form a + bi, where a and b are real numbers.
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13. Multiply and simplify: (6+ i)(7 + 9i). Write the answer in the form a + bi, where a and b are real numbers.

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Expert Answer

Step 1

Given expression is

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(6+i)(7+9i)

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Step 2

On multiply...

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(6+i)(7+9i)=(42+54i+ 7i +9i² ) + 9i {f =-1} =[42+61i +9(-1)] =[42+61i –9] (33+61i) =

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Math

Algebra