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Alinara [238K]
2 years ago
15

Identify the number of solutions to 3x + 21 = 3(x + 7).

Mathematics
2 answers:
chubhunter [2.5K]2 years ago
7 0
3x + 21 = 3(x + 7)
so what you do first is distribute on the left side (meaning you multiply everything in the parentheses by the number on the outside: in this case 3)
so: 3x + 21 = 3x + 21
now when it looks like this ☝️ (the same variables and the same coefficient) you can tell it’s all real numbers or infinitely many although you can continue to subtract 3x from each side to get: 21 = 21 (since it’s true it’s all real numbers / infinitely many)
hope this helps :)
ozzi2 years ago
5 0

Answer:

0

Step-by-step explanation:

3x+21=3(x+7)

3x+21=3x+21

3x-3x=21-21

0x=0

x=0

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9 + 768/2 +6
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3 years ago
12. Write the equation of a parabola with vertex at<br> (2, -3) and focus at (2,5),
Tatiana [17]

Step-by-step explanation:

The basic form of equation:

(x-h)²=4a(y-k),

(h,k)=coordinates of vertex

(h, k+a) = coordinate of focus

For given parabola:

axis of symmetry: x=2

(h, k) =(2,-3)

(h, k+a)=(2,5)

k+a=5

-3+a=5

a=8(distance from vertex to focus on the axis of symmetry)

equation: (x-2)²=4×8(y+3)

(x-2)²= 32(y+3)

7 0
2 years ago
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3 years ago
Read 2 more answers
Need help with homework
zubka84 [21]

Answer:

5. the other angle has to be 2x because of the other lines being equals so

2x+2x+x-15=180

5x-15=180

5x=195

x=19

6. the other two angle is ajacent to the other two so

3x+17+3x+17+x-9+x-9=360

8x+16=360

8x=344

x=43

7. this ones pretty simple

2x-4+3x+5+2x+11=180

7x+12=180

7x=168

x=24

8. this one to

x+x+4+3x-9=90

5x+5=90

5x=85

x=17

Hope This Helps!!!

5 0
2 years ago
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