Algebra question(6+5rad3)(1-rad3)...?

Question

steps

Answer 1

If you're just FOILing it, treat it like you would a normal variable expression:

(6+5rad3)(1-rad3) = (6)(1) - (6)(rad3) + (5rad3)(1) - (5rad3)(rad3)
= 6 - 6rad3 + 5rad3 - 5(3)
= 6 - rad3 - 15
= -9 - rad3