Question

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Answer 1

Perfect square trinomial implies this:
\[x^2 + 15x + c = (x + C)^2 \implies x^2 + 15x + c = x^2 + 2Cx + C^2 \implies C = 15/2 \]
\[c = C^2 = (15/2)^2 = 225/4\]

Answer 2

thank you sooooo much :D

Answer 3

Sure.

Answer 4

The middle term is twice the product of the square root of the first term and the square
root of the third term.

Answer 5

Square root of the first term = 1

Answer 6

Just ignore the first term..so it should be 2 times the square root of 'c'..so just find the square root of all the options and multiply by 2 and see if you get 15.

Answer 7

@adotm Please do not give answers, it's against OpenStudy's Code-of-Conduct. We are here to guide the asker to the answer, so we need his/her participation.

Please read the \(\bf\color{blue}{\underline{{\href{http:///openstudy.com/code-of-conduct}{Code-of-Conduct}}}}\) to learn more.

Answer 8

Thank you both!!

Answer 9

@iGreen: Sorry. Didn't know. I'm from some much more question, give answer websites.

Answer 10

It's fine, just try to guide them next time, your explanation was superb.