Question

3x(x + 7) = (3 x 9) + ( 3 x 7)​

Answer 1

Answer:

3x²+21x=27+21

3x²+21x=49

3x²+21x-49=0

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Step-by-step explanation:

Answer 2

Answer:

x=9

Step-by-step explanation:

3(x+7)=3(9)+3(7)

3x+21=27+21

3x+21=48

3x=48-21

3x=27

x=27/3

x=9