hayesvolcano
19.05.2021 •
Mathematics
There are 70 athlete at a meeting. They each shake hands with everyone else. How many handshakes were there?
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Ответ:
x = ± 2
Step-by-step explanation:
Given
16 - 2x² = - 64 ( subtract 16 from both sides )
- 2x² = - 80 ( divide both sides by - 2 )
x² = 40 ( take the square root of both sides )
x = ±
= ± 
= ± 2