4(x - 4) + 65 = -3x
4(x) - 4(4) + 65 = -3x
4x - 16 + 65 = -3x
4x + 49 = -3x
- 4x - 4x
49 = -7x
-7 -7
-7 = x
Simply you can substitute theta=45 degrees (or any angle,not zero) in left hand side and right hand side.
or
using a^2 - b^2 =(a+b)(a-b)
= sin(2x+x)sin(2x-x)
= sin 3x sin x
Answer:
7
Step-by-step explanation:
Answer:
72º
Step-by-step explanation:
<em>Hey there!</em>
Well the interior of a pentagon's angle is 108º,
so we do,
180 - 108 = 72º
<em>Hope this helps :)</em>
