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velikii [3]
2 years ago
14

Expand (3x+7)(3x-7) =

Mathematics
2 answers:
saveliy_v [14]2 years ago
8 0

Answer:

9 {x}^{2}  - 49

Step-by-step explanation:

Do FOIL, first outside inside last

3x × 3x = 9x^2

3x × -7 = -21x

7 × 3x = 21x

7 × -7 = -49

9 {x}^{2}   - 21x + 21x - 49 \: midde \: cancels \: each \: other \: out

So it would just be 9x^2 - 49

Tamiku [17]2 years ago
8 0

(3x + 7)(3x - 7) =

= 9x² + 21x - 21x - 49

= 9x² - 49

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Find the value of x. Round the length to the nearest tenth.
larisa [96]

Answer:

x = 7.9

Step-by-step explanation:

Given:  

Angle - 44

Hypotenuse - 11 ft

adjacent side - x

having adjacent and hypotenuse use Cosine to solve the problem from

S-oh C-ah T-oa

cos (angle) = adjacent / hypotenuse

**Make sure your calculator is in degree mode**

cos 44 = x/11

if you cross multiply, you get

11 cos 44 = x

or to solve for x you would multiply both sides by 11 and get

11 cos 44 = x

x = 7.9

3 0
3 years ago
Read 2 more answers
If f(x)=-3+7 and g(x)=-7+3, what is the value of f(-3) - g(3)
Andreyy89
F(x) = -3 + 7 = 4
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f(-3) - g(3) = 4 - (-4) = 4 + 4 = 8
6 0
3 years ago
Can someone please help me with this problem
Nadusha1986 [10]
X= 2/3

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X(6x-4) / x(x-6)

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5 0
3 years ago
Miguel conducts a survey of 750 college students to see how many of them have a part-time job. His results show that 500 of the
Bingel [31]
Miguel: 500 out of 750 students have part time jobs.

500 ÷ 250 = 2
750 ÷ 250 = 3

500:750 = 2:3


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C) 800 out of 1200 ⇒ 800/400 and 1200/400 ⇒ 2:3
D) 9000 out of 1300 ⇒ 9000/100 and 1300/100 ⇒ 90:13

Among the choices, Choice B could represent Kureshi's Data because it is not proportional to the data of Miguel.

Choice D is not possible. You cannot have a result that is way beyond the scope of your population. It is impossible to get 9000 students out of only 1300 students.

8 0
2 years ago
Read 2 more answers
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N76 [4]

Answer:

8 boxes of pens, 3 boxes of pencils

Step-by-step explanation:

120 is 3 boxes of pencils

120 is 8 boxes of pens

6 0
2 years ago
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