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Find the value of k so that 25n^2-kp will hve the factos (5n+9p)(5n-9p)

Mc2

wrote...

3 years ago

Quadratic Descriminant to find K

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bio_man

wrote...

#1

Subject Expert

Educator

3 years ago

25n^2-kp looks like a difference of squares. For example:

a^2 - b^2 = (a - b)(a + b)

If they want it as: (5n+9p)(5n-9p)

Then k has to be 81, because only then will you get 9 after square-rooting

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