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anonymous
 one year ago
Which polynomial is a perfect square trinomial?
49x^2  28x + 16
4a^2  20a + 25
25b^2  20b  16
16x^2  24x  9
anonymous
 one year ago
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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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0can you explain why?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.049x2−28x+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/completingsquare.html

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0They 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?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ANOTHER WAY TO SOLVE b2=4ac Would work, or even b=4ac−−−√ But not ac√=b ...
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