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aliya0001 [1]
3 years ago
8

PLEASE HELP!!! ASAP!!!!!

Mathematics
1 answer:
Natasha2012 [34]3 years ago
6 0
The first, second, and fourth are right
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Write the result of (4+9i)(7-4i) in a+bi form​
Serhud [2]

ANSWER

(4 + 9i)(7 - 4i) = 64 + 47i

EXPLANATION

The given complex number expression is:

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

We expand using the distributive property to get;

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

(4 + 9i)(7 - 4i) = 28- 16i +  63i - 36 {i}^{2}

Recall that,

{i}^{2}  =  - 1

Our expression now simplifies to:

(4 + 9i)(7 - 4i) = 28 + 47i  + 36

(4 + 9i)(7 - 4i) = 64 + 47i

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4 years ago
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Line AB contains points A (0, 1) and B (1, 5). The slope of line AB is
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Slope = 1-5/0-1 = 4
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3 years ago
3/5(4.3 – 7.8) + 2 1/9 ?
True [87]

Answer:

0.01

Step-by-step explanation:

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4 years ago
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Enlarge shape A by scale factor 4 with centre of enlargement (-2, 2).
dmitriy555 [2]

Answer:

(-6, 6), (2, 6), (-6, -2), (2, -2)

Step-by-step explanation:

Unfortunately, you can't just multiply the coordinates of the corners by 4.  That works if the center of the enlargement is the origin, (0, 0).  So you have to do this enlargement in 3 steps for <u>each</u> of the corner points.

Step 1  Move the point right 2 units and down 2 units (x,\,y) \to (x+2,\,y-2)<em>.</em>

The reason for this step is that this is what you do to move the center (-2, 2) to (0, 0).

Step 2  Multiply the new coordinates by 4.

Step 3 Move the new point left 2 units and up 2 units (x,\,y) \to (x-2,\,y+2).

Example:  using the upper-left corner (-3, 3)...

Step 1  (-3,\,3) \to (-1,\,1)

Step 2  (-1,\,1) \to (-4,\,4)

Step 3  (-4,\,4) \to (-6,\,6)

Repeat the process with the other three corners.

6 0
3 years ago
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