Question

if x= 1/(7+4√3) and y=1/(7-4√3 )find 5x² -7xy -5y²​

Answer 1

Answer:

-976.945

Step-by-step explanation:

If x=1/(7+4√3) ==> x = 7-4√3 (by factorization)

Similarly for y, it is y = 7+4√3

And xy = (7+4√3)*(7-4√3) = (7)^2 - (4√3)^2 = 49 - 48 = 1

==> x^2 - y^2 = (7-4√3)^2 - (7+4√3)^2 = -4*(7)*(4√3) = (-193.989) or (-112√3)

Now,

5*(x^2 - y^2) - 7*(xy) = 5*(-193.989) - 7*(1) = -976.945 approx.

Answer 2

Answer:

absda marke has brainlist

Step-by-step explanation:

13383+ 27377