Which polynomial is a perfect square trinomial? 49x^2 - 28x + 16 4a^2 - 20a + 25 25b^2 - 20b - 16 16x^2 - 24x - 9

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Which polynomial is a perfect square trinomial? 49x^2 - 28x + 16 4a^2 - 20a + 25 25b^2 - 20b - 16 16x^2 - 24x - 9

Algebra
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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second equation
can you explain why?
49x2−28x+16 Take the middle term −28 and then divide by two times the first term 2×49, then square it: (−282×49)2=(−27)2=414 This must be equatl to the last term. Since 16≠4/14, this one isn't a perfect square. You have to multiply the first term back http://www.mathsisfun.com/algebra/completing-square.html

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Other answers:

They said d=b2a You want e=0 to have a perfect square which means : c=b24a By the way b24a=a(b2a)2 49x2−28x+16 So b24a=(−28)24(49)=4≠16 4a2−20a+25 We use b24a=(−20)24(4)=40016=25=c So it is a complete square. Do you understand how I put b and a into the equation?
Yes!
ANOTHER WAY TO SOLVE b2=4ac Would work, or even b=4ac−−−√ But not ac√=b ...
THANK YOU!
yeah :)

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