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Factor this expression : 27y^3 - 343
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Factor this expression : 27y^3 - 343

Factor this expression : 27y^3 - 343-example-1
User Aphire
by
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2 Answers

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cube root of -343 is -7
cube of 27 is 3
(3y - 7)^3
User Rei
by
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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.
User FGreg
by
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