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

2 answers:

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 :)

ozzi3 years ago

5 0

Answer:

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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