davidchicago1654 davidchicago1654

30-07-2017
Mathematics

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Which polynomial is a perfect square trinomial? (1 point) 49x2 − 28x + 16 4a2 − 20a + 25 25b2 − 20b − 16 16x2 − 24x − 9?

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Banabanana Banabanana

30-07-2017

4a² − 20a + 25 is a perfect square trinomial

4a² − 20a + 25 =
(2a)² - 2*2a*5 + 5² =
(2a - 5)²

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