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devlian [24]
3 years ago
11

Can someone please help me

Mathematics
1 answer:
Nikolay [14]3 years ago
6 0

Answer:

B

Step-by-step explanation:

x²+2x=19 add 1 to both sides which gives you x²+2x+1=20

x²+2x+1 is the same as (x+1)²

Therefore (x+1)²=20

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