Question

answer of question no. 27

Answer 1

please apply a cube + b cube identity

a cube + b cube = (a+b)(a square - ab + b square)
hope this helps

Answer 2

alfabeta=3/2
alfa+beta=7/2
(alfa+beta)^2=(7/2)^2
alfa^2+beta^2+2alfabeta=49/4
alfa^2 +beta^2=49/4-2*3/2
alfa^2+beta^=49/4-3