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anonymous
 one year ago
Help, please?
Which polynomial is a perfect square trinomial?
49x2 − 28x + 16
4a2 − 20a + 25
25b2 − 20b − 16
16x2 − 24x − 9
anonymous
 one year ago
Help, please? Which polynomial is a perfect square trinomial? 49x2 − 28x + 16 4a2 − 20a + 25 25b2 − 20b − 16 16x2 − 24x − 9

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.0find the square root of the first and last terms and try to combine them to get the middle term

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0* first and last coefficients I should have said

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0(a + b^2 = a^2 + 2ab + b^2 a and b have to such that they can form 2ab

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I want to say B but I'm not sure

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0the last 2 option are incorrect because there are no real square roots of 16 and 9

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0what are the square roots of 2a^2 and 25

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0remember that 25 = 5*5 or 5*5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The square root of 25 is 5, but I'm not sure about 4a^2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Okay, that makes sense, so wait would the square root of 4a^2 be 2a?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0so if a = 2a and b = 5 what is the value of 2ab?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So it would be 2a*5 since b=5?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0what does that come to?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.02a*25, right? Since you really can't do anything with the A right now because we don't know what that is

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0NONO NEVERMIND 2a*10

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0its NEGATIVE 5 here because the middle term is negative

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh, okay. That makes more sense.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0so what does 2*10a simplify to?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I think that's right at least
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