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1hannacarson
11.12.2021 •
Mathematics
If
and
, then what is
?
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Ответ:
Recall that
(x + y)² = x² + 2xy + y²
Then if x + y = √7 and x² + y² = 6, we have
(√7)² = 6 + 2xy ⇒ 2xy = 1
We also have
(x - y)² = x² - 2xy + y²
so that
(x - y)² = 6 - 1 ⇒ (x - y)² = 5
which means x - y has two possible values, √5 or -√5.
Ответ:
the answer is 2.8% wait you got it good job
Step-by-step explanation: