Answer:
17 a(ii) : 4 - 2√3 and -4 +2√3.
Step-by-step explanation:
17 a (i).
(2 - √3)^2 = 4 - 4√3 + 3
= 7 - 4√3.
(ii) 28 - 16√3
= 4(7 - 4√3)
Now √4 = +/-2 and √7 - 4√3 = 2 - √3 ( as found in part (i)).
So the 2 square roots are 2(2 - √3) and -2(2 - √3)
= 4 - 2√3 and -4 +2√3.
