3 years ago

Simplify the expression (9 + 2i)(9 − 2i). 81 − 18i 81 + 18i 77 85

Mathematics

1 answer:

Ymorist [56]3 years ago

5 0

Answer:

=85

Step-by-step explanation:

I'm pretty sure I'm correct

You might be interested in

Find the indicated limit, if it exists. limit of f of x as x approaches 9 where f of x equals x plus 9 when x is less than 9 and

SVEN [57.7K]

Answer:

B. 18

Step-by-step explanation:

For the function

$f(x)=\left\{\begin{array}{l}x+9,\ \ x$

we can find the value of the function for all x that are very close to 9 but are less than 9 and for all values of x that are very close to 9 but are greater than 9.

1. For $x$

$\lim \limits_{x\rightarrow 9}f(x)=\lim \limits_{x\rightarrow 9}(x+9)=9+9=18$

2. For $x\ge 9:$

$\lim \limits_{x\rightarrow 9}f(x)=\lim \limits_{x\rightarrow 9}(27-x)=27-9=18$

So, limit exists and is equal to 18.

8 0

3 years ago

564 in scientific notation

MAXImum [283]

Answer: 5.64 *10^2

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

Question 2 Pyramids can be made of (check ALL that apply): circles squares triangles cylinders rectangles

PilotLPTM [1.2K]

The answers that apply are Triangles, Squares, and Rectangles. Because when you look at the base of the pyramid more closely, they are maded of 3 different kinds of shapes.

5 0

3 years ago

Justin rode his bicycle 5.3 miles a day for 17 days straight. How many miles did Justin ride altogether during the 17-day stretc

arsen [322]

The answer is B. 5.3 miles per day * 17 days = 90.1 total miles.

6 0

3 years ago

Read 2 more answers

a small airplane used 5 2/3 gallons of fuel to fly a 2 hour trip how many gallons were used each hour

Marat540 [252]

2.83 gallons were used per hour

7 0

3 years ago