Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Promoted
?
Lv 5
Factoring polynomials + zero product principle?
Original problem:
64y^3 - 2 = y - 128y^2
I turned it into
64y^3 - 2 - y + 128y^2 = 0
(64y^3 - y) + (128y^2 - 2) = 0
y(64y^2 - 1) + 2(64y^2 - 1) = 0
(64y^2 - 1) (y+2) = 0
I don't know what to do now. I'm supposed to solve it by factoring and then using the zero-product principle.
1 Answer
Relevance
- Old BookwormLv 77 years ago
(64y^2 - 1) (y+2) = 0
use difference of squares rule
(8y + 1)(8y - 1)(y + 2) = 0
so 8y + 1 = 0, 8y - 1 = 0, or y + 2 = 0
y = -1/8, +1/8, or -2
Still have questions? Get your answers by asking now.