kenbri0909
kenbri0909
22-06-2018
Mathematics
contestada
factor this expression : 27y^3 - 343
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Matheng
Matheng
22-06-2018
27 y³ - 343 = ???
27 y³ = 3y * 3y * 3y
343 = 7 * 7 * 7
∴ 27y³ - 343 = (3y-7)(9y² + 21y + 49 )
The correct answer is the first option.
Answer Link
memesbgud
memesbgud
22-06-2018
cube root of -343 is -7
cube of 27 is 3
(3y - 7)^3
Answer Link
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