anonymous
  • anonymous
Determine which polynomial is a perfect square trinomial. 49x2 − 28x + 16 9a2 − 30a + 25 25b2 − 45b − 81 16x2 − 24x − 9
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Zale101
  • Zale101
A perfect square trinomial is (ax^2 + bx +c) u need to know that A and C are positive values and always
Zale101
  • Zale101
So...calculate b^2 - 4ac and the polynomial will be a perfect square if ure equations equals to zero :)
Zale101
  • Zale101
\[b^2 - 4ac = 28^2 - 4*16*49 = 784 - 3136\] so A is not the answer

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Zale101
  • Zale101
Did u understand of anything i said? You can do the same like i did for the first equation and if u get 0 that's the answer.
Zale101
  • Zale101
@jen1511 , do u want me to do more equation for u :) ?
anonymous
  • anonymous
wait what im confused
Zale101
  • Zale101
I'll do B for u 9a^2 − 30a + 25 9a^2 = (3a)^2 25 = 5^2 = (3a - 5) ^2 another way b^2 - 4ac = 30^2 - 4x9x25 = 900 - 900 = 0
Zale101
  • Zale101
Does equation B seems a perfect square trinomial to u?
anonymous
  • anonymous
I guess yeah!
Zale101
  • Zale101
Yes

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