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vaifailady
@vaifailady
July 2022
1
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Известно, что a+b = 5, ab = -2. Найдите значение выражения
[tex] {(a - b)}^{2} [/tex]
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Universalka
Verified answer
(a + b)² = 5²
a² + 2ab + b² = 25
a² + 2 * (- 2) + b² = 25
a² - 4 + b² = 25
a² + b² = 29
(a - b)²
= a² - 2ab + b² = 29 - 2 * (- 2) = 29 + 4 =
33
13 votes
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Answers & Comments
Verified answer
(a + b)² = 5²a² + 2ab + b² = 25
a² + 2 * (- 2) + b² = 25
a² - 4 + b² = 25
a² + b² = 29
(a - b)² = a² - 2ab + b² = 29 - 2 * (- 2) = 29 + 4 = 33