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26.08.2019 •
Mathematics
which of the following represents the factorization of the binomial below?
x^2-81
a (x-9)(x-9)
b (x)(x-81)
c (x+9)(x+9)
d (x+9)(x-9)
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Ответ:
D
Step-by-step explanation:
x² - 81 ← is a difference of squares and factors in general as
a² - b² = (a + b)(a - b)
Here a = x and b = 9, thus
x² - 81 = (x + 9)(x - 9) → D
Ответ:
3/7 x 2 = 6/7
6/7 x 12 = 72/7 or 10 2/7.