3 years ago

If

Mathematics

1 answer:

Semenov [28]3 years ago

8 0

Answer:

Step-by-step explanation:

(m - n)² = 1

m² + n² = 13

m² - 2mn + n² = 1

( m² + n² ) - 2mn = 1

13 - 2mn = 1

- 2mn = 1 - 13

<em>- 2mn = - 12</em>

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