how to factor 16x²-72xy+81y²

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21-04-2014
Mathematics

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how to factor 16x²-72xy+81y²

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Gom3z18idn Gom3z18idn · Answer 1 · 2014-04-21T20:40:07-04:00

Gom3z18idn Gom3z18idn

21-04-2014

use the perfect square trinomial method. since 16x² is a perfect square and so is 81y² your answer would be (4x-9y)² when u multiply that out it will give u 16x²-72xy+81y²

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Анонимidn Анонимidn · Answer 2 · 2014-04-22T07:22:08-04:00

Анонимidn Анонимidn

22-04-2014

[tex]16x^2-72xy+81y^2=(4x)^2-2\cdot4x\cdot9y+(9y)^2=(4x-9y)^2\\\\=(4x-9y)(4x-9y)\\\\\\\\(a-b)^2=a^2-2ab+b^2[/tex]

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