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oee [108]
3 years ago
13

(6+9i)(6-9i) How to solve?

Mathematics
1 answer:
AlekseyPX3 years ago
5 0

~~(6+9i)(6-9i)\\\\=6^2-(9i)^2~~~~~~~~~~~~~~~~~~~;[a^2-b^2 =(a+b)(a-b)]\\\\=36-81i^2\\\\=36-81(-1)~~~~~~~~~~~~~~~~;[i^2 = -1]\\\\=36+81\\\\=117

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3 years ago
The perimeter of the rectangle below is 130 units. Find the value of z
aev [14]

Answer:

9 =z

Step-by-step explanation:

The perimeter of a rectangle is

P = 2(l+w) where l is the length and w is the width

P = 2(3z+2+ 4z)

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P = 2(7z+2)

Substitute in the perimeter

130 = 2( 7z+2)

Divide each side by 2

130/2 = 2/2 ( 7z+2)

65 = 7z+2

Subtract 2 from each side

65-2 = 7z+2-2

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8 0
3 years ago
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3 years ago
For a basic subscription a cable television provider charge is an activation fee of $60 plus $125 per month. What linear functio
Neko [114]

Answer:

y=125x+60

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let x be the number of months

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6 0
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