Factor this expression : 27y^3 - 343

asked Feb 15, 2019 136k views

1 vote

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2 votes

cube root of -343 is -7
cube of 27 is 3
(3y - 7)^3

Rei answered Feb 16, 2019

by Rei

6.6k points

4 votes

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.

FGreg answered Feb 22, 2019

by FGreg

5.9k points

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