Question

Please answer those questions fast....
I will mark you as brainliest.... ​

Answer 1

Answer:

3A. 19.95

5A. k=-3/2

Step-by-step explanation:

3A. x²+1/x²=(x+1/x)(x-1/x)

=(2√5+1/2√5)(2√5-1/2√5)

=(20+1/2√5)(20-2√5)

=(21/2√5*19/2√5)

=399/20

=19.95

5A. p(x)=5x³+4x²-6x+2k

p(1)=5+4-6+2k

0=3+2k

-3=2k

Therefore,

k=-3/2