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Kamron
Mathematics
17 September, 19:26
How do you factor 9y^4 - 1
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Helen Arias
17 September, 19:51
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Recognize the difference of 2 perfect squares
remember
a²-b² = (a+b) (a-b)
9y⁴ = (3y²) ²
1=1²
9y⁴-1 = (3y²) ² - (1) ² = (3y²+1) (3y²-1)
if we wanted to force a factor again
(3y²+1) (y√3+1) (y√3-1)
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