- #1

soggybread

- 20

- 0

What value of

*k*would make 25x^2 - 60xy +

*k*y^2 a perfect square trinomial?

I just don't know where to begin in order to find

*k*. :uhh:

Any help would be much appreciated!

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- Thread starter soggybread
- Start date

- #1

soggybread

- 20

- 0

What value of

I just don't know where to begin in order to find

Any help would be much appreciated!

- #2

d_leet

- 1,077

- 1

soggybread said:

What value ofkwould make 25x^2 - 60xy +ky^2 a perfect square trinomial?

I just don't know where to begin in order to findk. :uhh:

Any help would be much appreciated!

Ok well starting with a binomial (A + B)

then (A + B)

which is the same as

A

Which would be a perfect square trinomial so do you think you could right the trinomial in question in this form for some value of k?

- #3

HallsofIvy

Science Advisor

Homework Helper

- 43,021

- 970

Your formula is 25x

- #4

vaishakh

- 335

- 0

So you would get 60^2 = 4*25*k.

Moreover here the value of y does not matter if you look deep. The co-efficient of first power of x is 60y and the constant is ky^2

So (60y)^2 = 4*25*k*y^2.

- #5

soggybread

- 20

- 0

Ah! Thank You Guys! I see how it works now!

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