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Find the value of k so that each trinomial is a perfect square

49d^2-56d+k

2 answers

Hmmm. 2*sqrt(49)*sqrtk=56, right?

then sqrtk=56/(14)
and k= ????
Take the square root of 49 then multiply it by 2, which is 14
Take 56 and divide it by this number, 14 which is 4
k=4^2 which is 16
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