Answer:
Option (A) is the correct answer.
Step-by-step explanation:
Now,
∴
=
=
=
Therefore option (a) is the correct answer.
Number one is B Number two is also B
Answer ; -1/2
when expanded
5-8a-2+3a=13
5a=3-13
a=-5/10
a= -1/2
You're almost looking at the solution. Almost.
If it only said " r = 1 ", then that would be the solution right there.
But it says " | r | = 1 ", so there's a little more to it.
'r' can be either +1 or -1 and that equation will be a true statement.
So +1 and -1 are both solutions.