ushayuri
23.07.2019 •
Mathematics
What is the factored form of the expression? t2 – 81 a. (t + 9)(t – 9) b. (t + 81)(t – 1) c. (t + 9)2 d. (t – 9)2
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Ответ:
t² – 81
we know that
A difference of two perfect squares, (A² - B²) can be factored into (A+B) • (A-B)
let
A²> t²
B²> 9²
then
(t² – 9²)>(t+9)*(t-9)
the answer is
(t+9)*(t-9)
Ответ: