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anonymous
 one year ago
Select the polynomial that is a perfect square trinomial.
49x2 − 8x + 16
4a2 − 10a + 25
25b2 − 5b + 10
16x2 − 8x + 1
anonymous
 one year ago
Select the polynomial that is a perfect square trinomial. 49x2 − 8x + 16 4a2 − 10a + 25 25b2 − 5b + 10 16x2 − 8x + 1

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JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Have you tried factoring? Or the pythaorgean theorem?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I would, but I struggle with this kind of stuff and I need help to understand it

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Ok, for perfect square it has to factor to the form (ax + b)^2, so we can try factoring with the same numbers in each of the binomials.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1dw:1437761715779:dw I chose 7 because 7*7 is 49

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1And 4 because 4*4=16 and the middle number is negative.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Does that make sense so far?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So that's a perfect square?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1dw:1437761833427:dw We don't know yet. We need to check it and see if it gets us back to the original function.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Is that the same as A?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Ok, then that is not it. Can you try to do the same thing with B?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I don't think it is because I end up with 2a+5 and there's a negative in the middle, so no right?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Well, since there is a negative in the middle, we need to use 5 (2a5)(2a5)

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1But does that multiply back out to give us what we started with?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0no, it'd be 4a^220a+25

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Right, so that's not it. What about C?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I can't find the square root of ten so I don't think it's a perfect square

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Yeah, 10 doesn't have a perfect square, but we could:dw:1437762288347:dw

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1But you are right, that wouldn't be the answer. :)

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Let's check D.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Since the middle number is negative, we need to use 1

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Can you try multiplying out (4x1)(4x1)?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I got 16x^28x+1 :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thank you for helping, I got a 100%!! ^^

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Awesome! You`re welcome!
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