Answer:
Step-by-step explanation:
First, we can expand the brackets:
(given)
(combine like-terms)
Hope this helps :)
we know that
if triangle GHJ and triangle MKN are similar
then
m∠g°=m∠m°
m∠h°=m∠k°
m∠j°=m∠n°
therefore
<u>the answer is</u>
4
The first one is 4
The second on is 21