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goldenfox [79]
2 years ago
13

What is the product of (2+7i)(2-7i) in the from a+bi

Mathematics
2 answers:
eimsori [14]2 years ago
6 0
I = sqrt(-1), i^2 = -1

So multiplying it out;

4 - 14i + 14i - 49i^2

4 - 49 * -1

= 53
Luden [163]2 years ago
6 0

Answer:

Step-by-step explanation:

(2+7i)(2-7i)  =  2² - (7i)²              { ( a+b) (a-b) = a²-b² }

                  = 4 - 7² * i²

                    = 4 - 49* (-1)

                     = 4 + 49

                     = 53

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Write an equation that models this situation. At a sports banquet, 8 guests are seated at each of the 15 available tables. How m
DaniilM [7]

Answer: The equation that models this situation is:

x = 15 × 8  or x ÷ 8 = 15

Step-by-step explanation:

Let 'x' be the total number of guests who are seated at the tables.

If have to determine how many guests (x) are seated at the tables, all we need is to multiply the 15 with 8.

so the equation becomes

x = 15 × 8  or x ÷ 8 = 15

Therefore, the equation that models this situation is:

x = 15 × 8  or x ÷ 8 = 15

hope this helps good luck

6 0
3 years ago
Which represents the square of the sum of a number and 4 is 36
vfiekz [6]
36 divided by 4 =(9) which is the correct answer plz give brainliest
6 0
3 years ago
3(2y + 3) = 1(y + 1)
777dan777 [17]

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 =  − 8/5

Step-by-step explanation:

Distribute

3

(

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6

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9

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+

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9

=

+

1

6

+

9

−

9

=

+

1

−

9

5 0
3 years ago
Read 2 more answers
How many significant digits are there in 17.0
svet-max [94.6K]
The answer is three significant figures. The 1 and the 7 are both significant, because they are non-zero quantities.
This is where significant figures gets a little more complicated, because if a zero is used as a placeholder (i.e. 0.00027 cm) then it is insignificant.
But in the case above, the zero isn't being used as a placeholder, and thus, is significant.
4 0
3 years ago
How can elimination and substitution adapt to solve a system with nonlinear equations
larisa [96]
Because your gonna elminate the loners and soon your going to substitute them for numbers
8 0
3 years ago
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