Factor the polynomial 16 y ^2 - 25?

2008-09-08 12:42 pm

Factor the polynomial 16 y ^2 - 25

回答 (5)

2008-09-08 12:45 pm

✔ 最佳答案

16y^2 - 25
= (4y)^2 - 5^2
= (4y + 5)(4y - 5)

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2008-09-08 10:55 pm

( 4y - 5 ) ( 4y + 5 )

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2008-09-08 7:53 pm

16y^2 - 25
(4y)^2 - 5^2
(4y + 5)(4y - 5)

Please check this using FOIL

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2008-09-08 7:47 pm

(4y + 5) (4y - 5)

Check: (using FOIL)

(4y)(4y) = 16y^2
(4y)(-5) = -20y
(5)(4y) = 20y
(5)(-5) = -25

therefore 16y^2 - 20y + 20y - 25 = 16y^2 - 25

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2008-09-08 7:47 pm

16y^2-25
= (4y+5)(4y-5)

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